List of earthquakes in 1931

Earthquakes in 1931

Approximate epicenters of the earthquakes in 1931 4.0−5.9 magnitude 6.0−6.9 magnitude 7.0−7.9 magnitude 8.0+ magnitude
Strongest magnitude	Two events reached magnitude 7.9.
Deadliest	Xinjiang Province, China (Magnitude 7.9) August 10 10,000 deaths
Total fatalities	15,920
Number by magnitude
9.0+	0
8.0−8.9	0
7.0−7.9	24
6.0−6.9	97
5.0−5.9	3
← 1930 1932 →

This is a list of earthquakes in 1931. Only magnitude 6.0 or greater earthquakes appear on the list. Lower magnitude events are included if they have caused deaths, injury or damage. Events which occurred in remote areas will be excluded from the list as they wouldn't have generated significant media interest. All dates are listed according to UTC time. In a stark contrast to 1930, many large and destructive earthquakes occurred during 1931. The largest and deadliest event was the magnitude 7.9 earthquake which caused major devastation to China in August. New Zealand saw its worst natural disaster in February. Iran and Nicaragua had many deaths from earthquakes in the first half of the year. Other interesting events happened in Texas and the United Kingdom with the largest quakes for these areas hitting this year.

Overall

By death toll

Rank	Death toll	Magnitude	Location	Depth (km)	Date
1	10,000	7.9	Xinjiang Province, China	10.0	August 10
2	2,890	6.5	Nakhchivan Autonomous Republic, Azerbaijan	15.0	April 27
3	2,450	5.6	Jinotega Department, Nicaragua	0.0	March 31
4	256	7.4	Hawke's Bay, North Island, New Zealand	35.0	February 2
5	114	7.6	Oaxaca, Mexico	35.0	January 15
6	90	5.8	Korçë County, Albania	33.0	January 28
7	51	5.3	Peloponnese, Greece	0.0	January 4
8	50	7.9	Solomon Islands	15.0	October 3
9	16	6.5	Saitama Prefecture, Honshu, Japan	15.0	September 21

• Note: At least 10 casualties

By magnitude

Rank	Magnitude	Death toll	Location	Depth (km)	Date
1	7.9	10,000	Xinjiang Province, China	10.0	August 10
1	7.9	50	Solomon Islands	15.0	October 3
2	7.8	0	off the east coast of Honshu, Japan	35.0	March 9
3	7.7	0	Solomon Islands	15.0	October 10
4	7.6	114	Oaxaca, Mexico	35.0	January 15
4	7.6	0	Kachin State, Burma	15.0	January 27
5	7.5	1	east of Kyushu, Japan	35.0	November 2
6	7.4	256	Hawke's Bay, North Island, New Zealand	35.0	February 2
6	7.4	0	Primorsky Krai, Russia	356.7	February 20
6	7.4	0	Enggano Island, Indonesia	35.0	September 25
7	7.3	0	Manawatu-Wanganui, New Zealand	45.0	February 13
7	7.3	0	Banda Sea, Indonesia	100.0	March 28
8	7.2	0	south of Guam	15.0	January 28
8	7.2	0	Valparaiso Region, Chile	35.0	March 18
8	7.2	0	Baluchistan Province, Pakistan	10.0	August 27
9	7.1	0	north Atlantic Ocean	10.0	May 20
9	7.1	0	Xinjiang Province, China	10.0	August 18
9	7.1	0	Northern Mariana Islands	167.8	September 9
10	7.0	0	east of Enggano Island, Indonesia	35.0	February 10
10	7.0	0	Vanuatu	55.0	July 21
10	7.0	0	Sandaun Province, Papua New Guinea	35.0	August 7
10	7.0	0	Solomon Islands	15.0	October 3
10	7.0	0	Solomon Islands	15.0	October 3
10	7.0	0	south of Solomon Islands	15.0	October 3

• Note: At least 7.0 magnitude

Notable events

January

• A magnitude 6.4 earthquake struck east of Taiwan on January 1 at a depth of 15.0 km.^[1]
• A magnitude 6.7 earthquake struck off the coast of Jalisco, Mexico on January 2 at a depth of 20.0 km.^[2]
• A magnitude 5.3 earthquake struck the Peloponnese, Greece on January 4 at an unknown depth. At least 51 deaths were reported.^[3]
• A magnitude 6.0 earthquake struck Akita Prefecture, Honshu, Japan on January 9 at a depth of 140.0 km.^[4]
• A magnitude 6.5 earthquake struck off the east coast of Kamchatka, Russia on January 12 at a depth of 35.0 km.^[5]
• A magnitude 7.6 earthquake struck Oaxaca, Mexico on January 15 at a depth of 35.0 km. One-hundred and fourteen people were reported dead.^[6][7]
• A magnitude 6.8 earthquake struck northwest of the Ryukyu Islands, Japan on January 15 at a depth of 200.0 km.^[8]
• A magnitude 6.5 earthquake struck the Ninigo Islands, Papua New Guinea on January 15 at a depth of 15.0 km.^[9]
• A magnitude 6.3 aftershock struck Oaxaca, Mexico on January 16 at a depth of 30.0 km.^[10]
• A magnitude 6.7 earthquake struck the Gulf of California, Mexico on January 17 at a depth of 10.0 km.^[11]
• A magnitude 6.0 earthquake struck just north of Wetar, Indonesia on January 19 at a depth of 35.0 km.^[12]
• A magnitude 6.5 earthquake struck Badakhshan Province, Afghanistan on January 20 at a depth of 220.0 km.^[13]
• A magnitude 6.2 earthquake struck the Strait of Malacca on January 20 at a depth of 150.0 km.^[14]
• A magnitude 6.2 earthquake struck off the southeast coast of Hokkaido, Japan on January 21 at a depth of 120.0 km.^[15]
• A magnitude 6.2 earthquake struck Siargao, Philippines on January 24 at a depth of 35.0 km.^[16]
• A magnitude 7.6 earthquake struck Kachin State, Burma on January 27 at a depth of 15.0 km.^[17]
• A magnitude 5.8 earthquake struck Korçë County, Albania on January 28 at a depth of 33.0 km. Ninety people were killed and some damage was caused.^[18]
• A magnitude 7.2 earthquake struck south of Guam on January 28 at a depth of 15.0 km.^[19]

February

• A magnitude 7.4 earthquake struck Hawke's Bay, North Island, New Zealand on February 2 at a depth of 35.0 km. Two-hundred and fifty-six people were killed with two more missing presumed dead. Thousands of people were injured. Property damage costs are estimated at NZ $900,000,000 (2010 rates). This is currently the deadliest natural disaster to strike New Zealand. Many aftershocks were reported.^[20][21][22]
• A magnitude 6.4 earthquake struck off the east coast of North Island, New Zealand on February 8 at a depth of 15.0 km.^[23]
• A magnitude 7.0 earthquake struck just east of Enggano Island, Indonesia on February 10 at a depth of 35.0 km.^[24]
• A magnitude 6.4 earthquake struck east of Enggano Island, Indonesia on February 12 at a depth of 35.0 km.^[25]
• A magnitude 6.0 earthquake struck north of Taiwan on February 13 at a depth of 35.0 km.^[26]
• A magnitude 7.3 earthquake struck Manawatu-Wanganui, New Zealand on February 13 at a depth of 45.0 km. This was similar in magnitude to the deadly earthquake on February 2 and can be considered a doublet earthquake.^[27]
• A magnitude 6.6 earthquake struck southern Sumatra, Indonesia on February 14 at a depth of 15.0 km.^[28]
• A magnitude 6.3 earthquake struck southern Hokkaido, Japan on February 16 at a depth of 25.0 km.^[29]
• A magnitude 6.5 earthquake struck northeast of Enggano Island, Indonesia on February 19 at a depth of 35.0 km.^[30]
• A magnitude 7.4 earthquake struck Primorsky Krai, Russia on February 20 at a depth of 365.0 km.^[31]
• A magnitude 6.0 earthquake struck the Flores Sea, Indonesia on February 22 at a depth of 100.0 km.^[32]
• A magnitude 6.5 earthquake struck the Molucca Sea, Indonesia on February 27 at a depth of 35.0 km.^[33]

March

• A magnitude 6.5 earthquake struck south of Sakhalin, Russia on March 1 at a depth of 330.0 km.^[34]
• A magnitude 6.7 earthquake struck southeast of the Loyalty Islands on March 2 at a depth of 70.0 km.^[35]
• A magnitude 6.0 earthquake struck north of Simeulue island, Indonesia on March 5 at a depth of 35.0 km.^[36]
• A magnitude 6.0 earthquake struck Central Macedonia, Greece on March 7 at a depth of 35.0 km.^[37]
• A magnitude 6.0 earthquake struck under Lake Nicaragua, Nicaragua on March 7 at a depth of 80.0 km.^[38]
• A magnitude 6.6 earthquake struck the Southeastern Statistical Region, Republic of Macedonia on March 8 at a depth of 10.0 km.^[39]
• A magnitude 7.8 earthquake struck off the east coast of Honshu, Japan on March 9 at a depth of 35.0 km.^[40]
• A magnitude 6.0 earthquake struck the Banda Sea, Indonesia on March 11 at a depth of 35.0 km.^[41]
• A magnitude 6.7 earthquake struck the Volcano Islands, Japan on March 11 at a depth of 35.0 km.^[42]
• A magnitude 7.2 earthquake struck Valparaiso Region, Chile on March 18 at a depth of 35.0 km.^[43]
• A magnitude 6.7 earthquake struck south of Mindanao, Philippines on March 18 at a depth of 35.0 km.^[44]
• A magnitude 6.7 earthquake struck off the west coast of Luzon, Philippines on March 19 at a depth of 15.0 km. Some damage was reported.^[45][46]
• A magnitude 7.3 earthquake struck the Banda Sea, Indonesia on March 28 at a depth of 100.0 km.^[47]
• A magnitude 6.8 earthquake struck Hokkaido, Japan on March 29 at a depth of 80.0 km.^[48]
• A magnitude 5.6 earthquake struck Jinotega Department, Nicaragua on March 31 at an unknown depth. Although moderate in magnitude and quite far from Managua, this quake inflicted heavy damage on the capital with 2,450 deaths and property damage of $15 million (1931 rate).^[49]

April

• A magnitude 6.0 earthquake struck the Banda Sea, Indonesia on April 2 at a depth of 130.0 km.^[50]
• A magnitude 6.2 earthquake struck off the coast of northern Peru on April 3 at a depth of 35.0 km.^[51]
• A magnitude 6.2 earthquake struck Tucumán Province, Argentina on April 3 at a depth of 180.0 km.^[52]
• A magnitude 6.8 earthquake struck south of Fiji on April 3 at a depth of 630.0 km.^[53]
• A magnitude 6.5 earthquake struck southwest of Bougainville Island, Papua New Guinea on April 6 at a depth of 35.0 km.^[54]
• A magnitude 6.0 earthquake struck Papua (province), Indonesia on April 8 at a depth of 35.0 km.^[55]
• A magnitude 6.2 earthquake struck the far southern Kuril Islands, Russia on April 9 at a depth of 35.0 km.^[56]
• A magnitude 6.7 earthquake struck southwest of Bougainville Island, Papua New Guinea on April 24 at a depth of 15.0 km.^[57]
• A magnitude 6.5 earthquake struck Nakhchivan Autonomous Republic, Azerbaijan on April 27 at a depth of 15.0 km. Heavy damage and 2,890 deaths were reported.^[58][59]

May

• A magnitude 6.2 earthquake struck Barinas (state), Venezuela on May 1 at a depth of 35.0 km.^[60]
• A magnitude 6.5 earthquake struck Kamchatka Krai, Russia on May 12 at a depth of 50.0 km.^[61]
• A magnitude 6.2 earthquake struck Oaxaca, Mexico on May 16 at a depth of 35.0 km.^[62]
• A magnitude 7.1 earthquake struck the north Atlantic Ocean on May 20 at a depth of 10.0 km.^[63]
• A magnitude 6.2 earthquake struck off the coast of Atacama Region, Chile on May 20 at a depth of 35.0 km.^[64]
• A magnitude 6.2 earthquake struck the Dinagat Islands, Philippines on May 24 at a depth of 35.0 km.^[65]
• A magnitude 6.5 earthquake struck off the coast of Tarapacá Region, Chile on May 28 at a depth of 120.0 km.^[66]

June

• A magnitude 6.2 earthquake struck East New Britain Province, Papua New Guinea on June 1 at a depth of 35.0 km.^[67]
• A magnitude 6.5 earthquake struck Gifu Prefecture, Honshu, Japan on June 2 at a depth of 260.0 km.^[68]
• A magnitude 6.5 earthquake struck the Banda Sea, Indonesia on June 4 at a depth of 150.0 km.^[69]
• A magnitude 6.1 earthquake struck the North Sea off the east coast of England on June 7 at a depth of 70.0 km. This was the strongest earthquake ever recorded in the vicinity of the United Kingdom and caused some damage across England.^[70]
• A magnitude 6.0 earthquake struck off the east coast of Honshu, Japan on June 9 at a depth of 35.0 km.^[71]
• A magnitude 6.0 earthquake struck Ica Region, Peru on June 15 at a depth of 35.0 km.^[72]
• A magnitude 6.0 earthquake struck Tokyo, Japan on June 17 at a depth of 35.0 km.^[73]
• A magnitude 6.5 earthquake struck Morobe Province, Papua New Guinea on June 17 at a depth of 140.0 km.^[74]
• A magnitude 6.4 earthquake struck off the east coast of Honshu, Japan on June 23 at a depth of 25.0 km.^[75]
• A magnitude 6.5 earthquake struck off the south coast of Honshu, Japan on June 29 at a depth of 380.0 km.^[76]
• A magnitude 6.0 earthquake struck Coquimbo Region, Chile on June 29 at a depth of 35.0 km.^[77]

July

• A magnitude 6.2 earthquake struck Ucayali Region, Peru on July 11 at a depth of 120.0 km.^[78]
• A magnitude 6.5 earthquake struck just northeast of Ticao Island, Philippines on July 12 at a depth of 15.0 km.^[79]
• A magnitude 6.2 earthquake struck the far northern Sea of Okhotsk, Russia on July 15 at a depth of 35.0 km.^[80]
• A magnitude 6.2 earthquake struck Oaxaca, Mexico on July 17 at a depth of 35.0 km.^[81]
• A magnitude 6.8 earthquake struck Antofagasta Region, Chile on July 18 at a depth of 110.0 km.^[82]
• A magnitude 6.3 earthquake struck just off the east coast of Kamchatka, Russia on July 18 at a depth of 15.0 km.^[83]
• A magnitude 6.5 earthquake struck Samoa on July 20 at a depth of 80.0 km.^[84]
• A magnitude 7.0 earthquake struck Vanuatu on July 21 at a depth of 55.0 km.^[85]
• A magnitude 6.8 earthquake struck under southern Bougainville Island, Papua New Guinea on July 23 at a depth of 400.0 km.^[86]

August

• A magnitude 6.5 earthquake struck the Sea of Okhotsk, Russia on August 2 at a depth of 400.0 km.^[87]
• A magnitude 6.0 earthquake struck Buryatia, Russia on August 6 at a depth of 35.0 km.^[88]
• A magnitude 7.0 earthquake struck Sandaun Province, Papua New Guinea on August 7 at a depth of 35.0 km.^[89]
• A magnitude 7.9 earthquake struck Xinjiang Province, China on August 10 at a depth of 10.0 km. As many as 10,000 people were killed. Scores of homes were destroyed in the area.^[90][91]
• A magnitude 6.0 earthquake struck Badakhshan Province, Afghanistan on August 15 at a depth of 240.0 km.^[92]
• A magnitude 6.5 earthquake struck southwestern Texas on August 16 at a depth of 10.0 km. This was the largest earthquake recorded in Texas.^[93]
• A magnitude 7.1 aftershock struck Xinjiang Province, China on August 18 at a depth of 10.0 km.^[94]
• A magnitude 6.8 earthquake struck Baluchistan Province, Pakistan on August 24 at a depth of 10.0 km. This was a foreshock to a larger event that followed on August 27.^[95]
• A magnitude 7.2 earthquake struck Baluchistan Province, Pakistan on August 27 at a depth of 10.0 km. Fairly heavy damage was caused.^[96][97]

September

• A magnitude 6.2 earthquake struck off the east coast of Honshu, Japan on September 8 at a depth of 35.0 km.^[98]
• A magnitude 7.1 earthquake struck the Northern Mariana Islands on September 9 at a depth of 167.5 km.^[99]
• A magnitude 6.0 earthquake struck Kamchatka, Russia on September 12 at a depth of 35.0 km.^[100]
• A magnitude 6.2 earthquake struck off the west coast of Colombia on September 12 at a depth of 35.0 km.^[101]
• A magnitude 6.0 earthquake struck Yamanashi Prefecture, Honshu, Japan on September 16 at a depth of 35.0 km.^[102]
• A magnitude 6.5 earthquake struck Saitama Prefecture, Honshu, Japan on September 21 at a depth of 15.0 km. Sixteen people were killed and some damage was reported.^[103][104]
• A magnitude 6.7 earthquake struck the South China Sea on September 21 at a depth of 25.0 km.^[105]
• A magnitude 6.8 earthquake struck Gisborne Region, North Island, New Zealand on September 21 at a depth of 90.0 km.^[106]
• A magnitude 7.4 earthquake struck Enggano Island, Indonesia on September 25 at a depth of 35.0 km. Some damage was reported.^[107][108]
• A magnitude 6.0 aftershock struck northeast of Enggano Island, Indonesia on September 25 at a depth of 35.0 km.^[109]
• A magnitude 6.0 earthquake struck San Marcos Department, Guatemala on September 26 at a depth of 60.0 km.^[110]
• A magnitude 6.0 earthquake struck the Molucca Sea, Indonesia on September 29 at a depth of 35.0 km.^[111]

October

• A magnitude 6.0 earthquake struck the Gulf of California, Mexico on October 1 at a depth of 35.0 km.^[112]
• A magnitude 7.9 earthquake struck the Solomon Islands on October 3 at a depth of 15.0 km. A series of strong aftershocks followed the main shock. A destructive tsunami caused the deaths of 50 people with many homes being destroyed.^{[113][114][115]}
• A magnitude 7.0 aftershock struck south of the Solomon Islands on October 3 at a depth of 15.0 km.^[116]
• A magnitude 7.0 aftershock struck the Solomon Islands on October 3 at a depth of 15.0 km.^[117]
• A magnitude 7.0 aftershock struck the Solomon Islands on October 3 at a depth of 35.0 km.^[118]
• A magnitude 6.8 earthquake struck Badakhshan Province, Afghanistan on October 5 at a depth of 200.0 km.^[119]
• A magnitude 7.7 earthquake struck the Solomon Islands on October 10 at a depth of 15.0 km. As in the event on October 3 a series of strong aftershocks followed.^[120]
• A magnitude 6.8 aftershock struck the Solomon Islands on October 10 at a depth of 35.0 km.^[121]
• A magnitude 6.8 aftershock struck the Solomon Islands on October 10 at a depth of 15.0 km.^[122]
• A magnitude 6.8 aftershock struck the Solomon Islands on October 10 at a depth of 15.0 km.^[123]
• A magnitude 6.4 earthquake struck the far northern Sea of Okhotsk, Russia on October 10 at a depth of 35.0 km.^[124]
• A magnitude 6.0 earthquake struck off the south coast of Panama on October 12 at a depth of 35.0 km.^[125]
• A magnitude 6.8 earthquake struck south of Fiji on October 18 at a depth of 485.0 km.^[126]
• A magnitude 6.2 earthquake struck north of Luzon, Philippines on October 28 at a depth of 25.0 km.^[127]
• A magnitude 6.5 earthquake struck the Northern Mariana Islands on October 29 at a depth of 520.0 km.^[128]

November

• A magnitude 6.5 earthquake struck east of Kyushu, Japan on November 1 at a depth of 35.0 km.^[129]
• A magnitude 6.6 earthquake struck Oaxaca, Mexico on November 2 at a depth of 35.0 km.^[130]
• A magnitude 7.5 earthquake struck east of Kyushu, Japan on November 2 at a depth of 35.0 km. One person died and 14 homes were destroyed.^[131][132]
• A magnitude 6.5 earthquake struck Gulf Province, Papua New Guinea on November 2 at a depth of 15.0 km.^[133]
• A magnitude 6.0 earthquake struck Iwate Prefecture, Honshu, Japan on November 3 at a depth of 35.0 km.^[134]
• A magnitude 6.4 earthquake struck Xinjiang Province, China on November 5 at a depth of 10.0 km.^[135]
• A magnitude 6.7 earthquake struck central Makira, Solomon Islands on November 20 at a depth of 15.0 km.^[136]

December

• During the month there were some magnitude 6.0+ events but these mostly struck remote areas and were not deemed significant enough for inclusion.

References

1. "M6.4 - Taiwan region". United States Geological Survey. January 1, 1931. Retrieved March 28, 2016.
2. "M6.7 - off the coast of Jalisco, Mexico". United States Geological Survey. January 2, 1931. Retrieved March 28, 2016.
3. "Significant Earthquake GREECE: CORINTH-ISTHMIA (CORINTHIA)". National Geophysical Data Center. January 4, 1931. Retrieved March 28, 2016.
4. "On-Line Bulletin". International Seismological Centre. January 9, 1931. Retrieved March 28, 2016.
5. "On-Line Bulletin". International Seismological Centre. January 12, 1931. Retrieved March 28, 2016.
6. "M7.6 - Oaxaca, Mexico". United States Geological Survey. January 15, 1931. Retrieved March 28, 2016.
7. "Historic World Earthquakes". United States Geological Survey. January 15, 1931. Retrieved March 28, 2016.
8. "On-Line Bulletin". International Seismological Centre. January 15, 1931. Retrieved March 28, 2016.
9. "M6.5 - Ninigo Islands region, Papua New Guinea". United States Geological Survey. January 15, 1931. Retrieved March 28, 2016.
10. "M6.3 - Oaxaca, Mexico". United States Geological Survey. January 16, 1931. Retrieved March 28, 2016.
11. "M6.7 - Gulf of California". United States Geological Survey. January 17, 1931. Retrieved March 28, 2016.
12. "On-Line Bulletin". International Seismological Centre. January 19, 1931. Retrieved March 28, 2016.
13. "On-Line Bulletin". International Seismological Centre. January 20, 1931. Retrieved March 28, 2016.
14. "On-Line Bulletin". International Seismological Centre. January 20, 1931. Retrieved March 28, 2016.
15. "On-Line Bulletin". International Seismological Centre. January 21, 1931. Retrieved March 28, 2016.
16. "On-Line Bulletin". International Seismological Centre. January 24, 1931. Retrieved March 28, 2016.
17. "M7.6 - Myanmar". United States Geological Survey. January 27, 1931. Retrieved March 28, 2016.
18. "Significant Earthquake ALBANIA: KORCE". National Geophysical Data Center. January 28, 1931. Retrieved March 28, 2016.
19. "M7.2 - south of the Mariana Islands". United States Geological Survey. January 28, 1931. Retrieved March 28, 2016.
20. http://info.geonet.org.nz/display/quake/M+7.8%2C+Hawke%27s+Bay%2C+3+February+1931
21. "M7.4 - North Island of New Zealand". United States Geological Survey. February 2, 1931. Retrieved March 29, 2016.
22. "Significant Earthquake NEW ZEALAND: HAWKE BAY". National Geophysical Data Center. February 2, 1931. Retrieved March 29, 2016.
23. "M6.4 - off the east coast of the North Island of New Zealand". United States Geological Survey. February 8, 1931. Retrieved March 29, 2016.
24. "M7.0 - southern Sumatra, Indonesia". United States Geological Survey. February 10, 1931. Retrieved March 29, 2016.
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27. "M7.3 - North Island of New Zealand". United States Geological Survey. February 13, 1931. Retrieved March 29, 2016.
28. "M6.6 - southern Sumatra, Indonesia". United States Geological Survey. February 14, 1931. Retrieved March 29, 2016.
29. "M6.3 - Hokkaido, Japan region". United States Geological Survey. February 16, 1931. Retrieved March 29, 2016.
30. "M6.5 - southern Sumatra, Indonesia". United States Geological Survey. February 19, 1931. Retrieved March 29, 2016.
31. "On-Line Bulletin". International Seismological Centre. February 20, 1931. Retrieved March 29, 2016.
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35. "M6.7 - southeast of the Loyalty Islands". United States Geological Survey. March 2, 1931. Retrieved March 29, 2016.
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43. "M7.2 - Valparaiso, Chile". United States Geological Survey. March 18, 1931. Retrieved March 29, 2016.
44. "M6.7 - Mindanao, Philippines". United States Geological Survey. March 18, 1931. Retrieved March 29, 2016.
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58. "M6.5 - Naxcivan, Azerbaijan". United States Geological Survey. April 27, 1931. Retrieved March 31, 2016.
59. "Significant Earthquake ARMENIA: ZANGEZUR, NAKHITCHEVAN". National Geophysical Data Center. April 27, 1931. Retrieved March 31, 2016.
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62. "On-Line Bulletin". International Seismological Centre. May 16, 1931. Retrieved April 1, 2016.
63. "M7.1 - Azores-Cape St. Vincent Ridge". United States Geological Survey. May 20, 1931. Retrieved April 1, 2016.
64. "On-Line Bulletin". International Seismological Centre. May 20, 1931. Retrieved April 1, 2016.
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66. "On-Line Bulletin". International Seismological Centre. May 28, 1931. Retrieved April 1, 2016.
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69. "On-Line Bulletin". International Seismological Centre. June 4, 1931. Retrieved April 1, 2016.
70. "Significant Earthquake UK: SCARBOROUGH, GRIMSBY". National Geophysical Data Center. June 7, 1931. Retrieved April 1, 2016.
71. "On-Line Bulletin". International Seismological Centre. June 9, 1931. Retrieved April 1, 2016.
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73. "On-Line Bulletin". International Seismological Centre. June 17, 1931. Retrieved April 1, 2016.
74. "On-Line Bulletin". International Seismological Centre. June 17, 1931. Retrieved April 1, 2016.
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77. "On-Line Bulletin". International Seismological Centre. June 29, 1931. Retrieved April 1, 2016.
78. "On-Line Bulletin". International Seismological Centre. July 11, 1931. Retrieved April 2, 2016.
79. "M6.5 - Masbate region, Philippines". United States Geological Survey. July 12, 1931. Retrieved April 2, 2016.
80. "On-Line Bulletin". International Seismological Centre. July 15, 1931. Retrieved April 2, 2016.
81. "On-Line Bulletin". International Seismological Centre. July 17, 1931. Retrieved April 2, 2016.
82. "On-Line Bulletin". International Seismological Centre. July 18, 1931. Retrieved April 2, 2016.
83. "M6.3 - near the east coast of the Kamchatka Peninsula, Russia". United States Geological Survey. July 18, 1931. Retrieved April 2, 2016.
84. "On-Line Bulletin". International Seismological Centre. July 20, 1931. Retrieved April 2, 2016.
85. "On-Line Bulletin". International Seismological Centre. July 21, 1931. Retrieved April 2, 2016.
86. "On-Line Bulletin". International Seismological Centre. July 23, 1931. Retrieved April 2, 2016.
87. "On-Line Bulletin". International Seismological Centre. August 2, 1931. Retrieved April 2, 2016.
88. "On-Line Bulletin". International Seismological Centre. August 6, 1931. Retrieved April 2, 2016.
89. "M7.0 - near the north coast of New Guinea, Papua New Guinea". United States Geological Survey. August 7, 1931. Retrieved April 2, 2016.
90. "M7.9 - northern Xinjiang, China". United States Geological Survey. August 10, 1931. Retrieved April 2, 2016.
91. "Significant Earthquake CHINA: XINJIANG WEIWUER ZIZHIQU PROVINCE: N". National Geophysical Data Center. August 10, 1931. Retrieved April 2, 2016.
92. "On-Line Bulletin". International Seismological Centre. August 15, 1931. Retrieved April 2, 2016.
93. "M6.5 - Texas-Chihuahua border region". United States Geological Survey. August 16, 1931. Retrieved April 2, 2016.
94. "M7.1 - northern Xinjiang, China". United States Geological Survey. August 18, 1931. Retrieved April 2, 2016.
95. "M6.8 - Pakistan". United States Geological Survey. August 24, 1931. Retrieved April 2, 2016.
96. "M7.2 - Pakistan". United States Geological Survey. August 27, 1931. Retrieved April 2, 2016.
97. "Significant Earthquake PAKISTAN: MACH,BALUCHISTAN". National Geophysical Data Center. August 27, 1931. Retrieved April 2, 2016.
98. "On-Line Bulletin". International Seismological Centre. September 8, 1931. Retrieved April 3, 2016.
99. "On-Line Bulletin". International Seismological Centre. September 9, 1931. Retrieved April 3, 2016.
100. "On-Line Bulletin". International Seismological Centre. September 12, 1931. Retrieved April 3, 2016.
101. "On-Line Bulletin". International Seismological Centre. September 12, 1931. Retrieved April 3, 2016.
102. "On-Line Bulletin". International Seismological Centre. September 16, 1931. Retrieved April 3, 2016.
103. "M6.5 - eastern Honshu, Japan". United States Geological Survey. September 21, 1931. Retrieved April 3, 2016.
104. "Significant Earthquake JAPAN: HONSHU". National Geophysical Data Center. September 21, 1931. Retrieved April 3, 2016.
105. "M6.7 - South China Sea". United States Geological Survey. September 21, 1931. Retrieved April 3, 2016.
106. "On-Line Bulletin". International Seismological Centre. September 21, 1931. Retrieved April 3, 2016.
107. "M7.4 - southern Sumatra, Indonesia". United States Geological Survey. September 25, 1931. Retrieved April 3, 2016.
108. "Significant Earthquake SW. SUMATRA". National Geophysical Data Center. September 25, 1931. Retrieved April 3, 2016.
109. "On-Line Bulletin". International Seismological Centre. September 25, 1931. Retrieved April 3, 2016.
110. "On-Line Bulletin". International Seismological Centre. September 26, 1931. Retrieved April 3, 2016.
111. "On-Line Bulletin". International Seismological Centre. September 29, 1931. Retrieved April 3, 2016.
112. "On-Line Bulletin". International Seismological Centre. October 1, 1931. Retrieved April 3, 2016.
113. "M7.9 - Solomon Islands". United States Geological Survey. October 3, 1931. Retrieved April 3, 2016.
114. "Significant Earthquake SOLOMON ISLANDS: SAN CRISTOBAL ISLAND". National Geophysical Data Center. October 3, 1931. Retrieved April 3, 2016.
115. "Tsunami Event SAN CRISTOBAL ISLAND". National Geophysical Data Center. October 3, 1931. Retrieved April 3, 2016.
116. "M7.0 - Solomon Islands". United States Geological Survey. October 3, 1931. Retrieved April 3, 2016.
117. "On-Line Bulletin". International Seismological Centre. October 3, 1931. Retrieved April 3, 2016.
118. "M7.0 - Solomon Islands". United States Geological Survey. October 3, 1931. Retrieved April 3, 2016.
119. "On-Line Bulletin". International Seismological Centre. October 5, 1931. Retrieved April 3, 2016.
120. "M7.7 - Solomon Islands". United States Geological Survey. October 10, 1931. Retrieved April 3, 2016.
121. "On-Line Bulletin". International Seismological Centre. October 10, 1931. Retrieved April 3, 2016.
122. "On-Line Bulletin". International Seismological Centre. October 10, 1931. Retrieved April 3, 2016.
123. "On-Line Bulletin". International Seismological Centre. October 10, 1931. Retrieved April 3, 2016.
124. "M6.4 - Magadanskaya Oblast', Russia". United States Geological Survey. October 10, 1931. Retrieved April 3, 2016.
125. "On-Line Bulletin". International Seismological Centre. October 12, 1931. Retrieved April 3, 2016.
126. "On-Line Bulletin". International Seismological Centre. October 18, 1931. Retrieved April 3, 2016.
127. "M6.2 - Luzon, Philippines". United States Geological Survey. October 28, 1931. Retrieved April 3, 2016.
128. "On-Line Bulletin". International Seismological Centre. October 29, 1931. Retrieved April 3, 2016.
129. "On-Line Bulletin". International Seismological Centre. November 1, 1931. Retrieved April 4, 2016.
130. "On-Line Bulletin". International Seismological Centre. November 2, 1931. Retrieved April 4, 2016.
131. "M7.5 - southeast of Shikoku, Japan". United States Geological Survey. November 2, 1931. Retrieved April 4, 2016.
132. "Significant Earthquake JAPAN: KYUSHU". National Geophysical Data Center. November 2, 1931. Retrieved April 4, 2016.
133. "M6.5 - near the south coast of New Guinea, Papua New Guinea". United States Geological Survey. November 2, 1931. Retrieved April 4, 2016.
134. "On-Line Bulletin". International Seismological Centre. November 3, 1931. Retrieved April 4, 2016.
135. "M6.4 - northern Xinjiang, China". United States Geological Survey. November 5, 1931. Retrieved April 4, 2016.
136. "M6.7 - Solomon Islands". United States Geological Survey. November 20, 1931. Retrieved April 4, 2016.