List of earthquakes in 1928 explained
Year: | 1928 |
Location Map: | Earth |
Largest: | Mexico, Oaxaca, (Magnitude 8.0) June 17 |
Deadliest: | Chile Maule Region, (Magnitude 7.7) December 1, 279 deaths |
Fatalities: | 807 |
9.0+: | 0 |
8.0−8.9: | 1 |
7.0−7.9: | 18 |
6.0−6.9: | 54 |
5.0−5.9: | 4 |
This is a list of earthquakes in 1928. Only magnitude 6.0 or greater earthquakes appear on the list. Lower magnitude events are included if they have caused death, 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. It was an active year with several events leading to deaths. Worst affected were Chile, Turkey, Bulgaria and the Philippines. Oaxaca, Mexico and Puno Region, Peru sustained several large earthquakes with the former seeing four reaching above magnitude 7.0. In spite of a series of earthquakes, only four deaths were caused in Mexico during the year.
Overall
By death toll
Rank | Death toll | Magnitude | Location | MMI | Depth (km) | Date |
---|
1 | | | Chile, Maule Region | | | |
2 | | | Turkey, Izmir Province | | | |
3 | | | Bulgaria, Stara Zagora Province and Plovdiv Province | | | , |
4 | | | Philippines, Mindanao | | | |
5 | | | Italy, off the west coast of Calabria | | | |
6 | | | Peru, Amazonas Region | | | |
7 | | | Greece, Peloponnese (region) | | | |
= 8 | | | Peru, Puno Region | | | |
= 8 | | | Iran, North Khorasan Province | | | | |
- Note: At least 10 casualties
By magnitude
Rank | Magnitude | Death toll | Location | MMI | Depth (km) | Date |
---|
1 | | | Mexico, Oaxaca | | | |
= 2 | | | southern Indian Ocean | | | |
= 2 | | | Chile, Maule Region | | | |
= 3 | | | France, southeast of the Loyalty Islands | | | |
= 3 | | | Mexico, Oaxaca | | | |
4 | | | Mexico, Oaxaca | | | |
5 | | | Philippines, Mindanao | | | |
6 | | | Peru, Amazonas Region | | | |
7 | | | Mexico, off the coast of Oaxaca | | | |
= 8 | | | Bulgaria, Stara Zagora Province | | | |
= 8 | | | Bulgaria, Plovdiv Province | | | |
= 8 | | | Japan, off the east coast of Honshu | | | |
= 8 | | | , east of | | | |
= 9 | | | British Kenya, Baringo County | | | |
= 9 | | | Japan, Izu Islands | | | |
= 9 | | | Peru, Cajamarca Region | | | |
= 9 | | | | | | |
= 9 | | | Chile, off the coast of Maule Region | | | |
= 9 | | | , off the south coast of Papua (province) | | | | |
- Note: At least 7.0 magnitude
Notable events
January
Month: | January |
8.0–8.9: | 0 |
7.0–7.9: | 1 |
6.0–6.9: | 4 |
Largest: | 7.0 Mw British Kenya |
Fatalities: | 0 |
Date! rowspan="2" style="width: 310px"Country and location | Mw | Depth (km) | MMI | Notes | Casualties |
---|
Dead | Injured |
---|
[1] | | 6.5 | 530.0 | | | | |
[2] | | 6.8 | 540.0 | | | | |
[3] | | 7.0 | 15.0 | | | | |
[4] | | 6.2 | 10.0 | | Aftershock. | | |
[5] | | 6.3 | 30.0 | | | | | |
February
Month: | February |
8.0–8.9: | 0 |
7.0–7.9: | 0 |
6.0–6.9: | 4 |
Largest: | 6.6 Mw Russian SFSR |
Fatalities: | 0 |
Date! rowspan="2" style="width: 310px"Country and location | Mw | Depth (km) | MMI | Notes | Casualties |
---|
Dead | Injured |
---|
[6] | | 6.2 | 35.0 | | | | |
[7] [8] | | 6.5 | 100.0 | | Fairly heavy damage was reported. | | |
[9] | | 6.6 | 10.0 | | | | |
[10] | | 6.5 | 10.0 | | | | | |
March
Month: | March |
8.0–8.9: | 0 |
7.0–7.9: | 4 |
6.0–6.9: | 5 |
5.0-5.9: | 2 |
Largest: | 7.7 Mw southern Indian Ocean |
Deadliest: | 6.4 Mw Turkey 170 deaths |
Fatalities: | 225+ |
Date! rowspan="2" style="width: 310px"Country and location | Mw | Depth (km) | MMI | Notes | Casualties |
---|
Dead | Injured |
---|
[11] [12] | | 6.0 | 120.0 | | At least 51 deaths were caused as well as some damage. | 51+ | |
[13] | | 6.2 | 15.0 | | | | |
[14] | | 5.0 | 0.0 | | 4 deaths were reported as well as some damage. The depth was unknown. | 4 | |
[15] | | 7.7 | 15.0 | | | | |
[16] | | 6.5 | 75.0 | | | | |
[17] | | 7.6 | 10.0 | | | | |
[18] | | 7.6 | 15.0 | | | | |
[19] | | 6.2 | 35.0 | | | | |
[20] | | 5.8 | 33.0 | | 40 people were injured and many homes were destroyed. | | 40 |
[21] | | 7.0 | 405.0 | | | | |
[22] [23] | | 6.4 | 10.0 | | 170 deaths were reported and a further 700 people were hurt. 2,600 homes collapsed and many were damaged. | 170 | 700 | |
April
Month: | April |
8.0–8.9: | 0 |
7.0–7.9: | 2 |
6.0–6.9: | 5 |
Largest: | 7.1 Mw Bulgaria 2 events |
Deadliest: | 7.1 Mw Bulgaria 127 deaths |
Fatalities: | 157 |
Date! rowspan="2" style="width: 310px"Country and location | Mw | Depth (km) | MMI | Notes | Casualties |
---|
Dead | Injured |
---|
[24] [25] [26] | | 6.7 | 25.0 | | The main destruction was caused by a flood. Landslides blocked a river and the ensuing flooding led to 10 deaths and many homes being destroyed. | 10 | |
[27] [28] | | 7.1 | 10.0 | | The 1928 Chirpan–Plovdiv earthquakes caused major destruction. These events are an example of a doublet earthquake. The effects of both events are listed here. 127 people were killed and 1,735 were injured. 74,750 homes were destroyed. | 127 | 1,735 |
[29] | | 6.5 | 35.0 | | | | |
[30] [31] | | 7.1 | 15.0 | | The fatalities and damages from this event are included in the previous event. | | |
[32] | | 6.5 | 350.0 | | | | |
[33] | | 6.0 | 29.0 | | 20 people were killed and 3,000 homes were destroyed. | 20 | |
[34] [35] | | 6.5 | 25.0 | | | | | |
May
Month: | May |
8.0–8.9: | 0 |
7.0–7.9: | 2 |
6.0–6.9: | 2 |
Largest: | 7.3 Mw Peru |
Deadliest: | 7.3 Mw Peru 29 deaths |
Fatalities: | 29 |
Date! rowspan="2" style="width: 310px"Country and location | Mw | Depth (km) | MMI | Notes | Casualties |
---|
Dead | Injured |
---|
[36] | | 6.5 | 570.0 | | | | |
[37] [38] | | 7.3 | 120.0 | | 29 people were killed in the 1928 Chachapoyas earthquake. Property damage costs were $8 million (1928 rate). | 29 | |
[39] | | 6.2 | 130.0 | | | | |
[40] | | 7.2 | 35.0 | | | | | |
June
Month: | June |
8.0–8.9: | 1 |
7.0–7.9: | 1 |
6.0–6.9: | 8 |
Largest: | 8.0 Mw Mexico |
Deadliest: | 8.0 Mw Mexico 4 deaths |
Fatalities: | 4 |
Date! rowspan="2" style="width: 310px"Country and location | Mw | Depth (km) | MMI | Notes | Casualties |
---|
Dead | Injured |
---|
[41] | | 6.3 | 20.0 | | Aftershock. | | |
[42] | | 6.3 | 10.0 | | | | |
[43] | | 6.0 | 430.0 | | | | |
[44] [45] [46] | | 6.9 | 25.0 | | Some homes were destroyed. A tsunami washed away a rail line. | | |
[47] | | 6.7 | 15.0 | | Aftershock. | | |
[48] [49] [50] | | 8.0 | 20.0 | | 4 people were killed and some damage was reported. A tsunami was generated. | 4 | |
[51] | | 6.7 | 15.0 | | | | |
[52] | | 6.8 | 15.0 | | | | |
[53] | | 6.5 | 120.0 | | | | |
[54] | , east of | 7.1 | 15.0 | | | | | |
July
Month: | July |
8.0–8.9: | 0 |
7.0–7.9: | 1 |
6.0–6.9: | 3 |
5.0-5.9: | 1 |
Largest: | 7.0 Mw Peru |
Deadliest: | 5.8 Mw China 6 deaths |
Fatalities: | 6 |
Date! rowspan="2" style="width: 310px"Country and location | Mw | Depth (km) | MMI | Notes | Casualties |
---|
Dead | Injured |
---|
[55] | | 6.5 | 15.0 | | | | |
[56] [57] | | 7.0 | 120.0 | | | | |
[58] | | 5.8 | 0.0 | | 6 people were killed and 10 were injured. Some homes were destroyed. | 6 | 10 |
[59] | | 6.0 | 100.0 | | | | |
[60] | | 6.5 | 50.0 | | | | | |
August
Month: | August |
8.0–8.9: | 0 |
7.0–7.9: | 2 |
6.0–6.9: | 4 |
5.0-5.9: | 1 |
Largest: | 7.2 Mw Mexico |
Deadliest: | 5.4 Mw Iran 10 deaths |
Fatalities: | 10 |
Date! rowspan="2" style="width: 310px"Country and location | Mw | Depth (km) | MMI | Notes | Casualties |
---|
Dead | Injured |
---|
[61] | | 7.2 | 20.0 | | | | |
[62] | | 6.2 | 35.0 | | | | |
[63] | | 6.8 | 255.0 | | | | |
[64] | | 6.3 | 15.0 | | | | |
[65] | | 6.5 | 620.0 | | | | |
[66] | | 5.4 | 9.0 | | 10 people were killed and some damage was reported. | 10 | |
[67] | | 7.0 | 190.0 | | | | | |
September
Month: | September |
8.0–8.9: | 0 |
7.0–7.9: | 0 |
6.0–6.9: | 7 |
Largest: | 6.8 Mw 2 events |
Fatalities: | 0 |
Date! rowspan="2" style="width: 310px"Country and location | Mw | Depth (km) | MMI | Notes | Casualties |
---|
Dead | Injured |
---|
[68] | | 6.5 | 35.0 | | | | |
[69] | | 6.2 | 15.0 | | | | |
[70] | | 6.5 | 35.0 | | | | |
[71] | | 6.8 | 225.0 | | | | |
[72] | | 6.8 | 15.0 | | | | |
[73] | | 6.0 | 120.0 | | | | |
[74] | | 6.5 | 35.0 | | | | | |
October
Month: | October |
8.0–8.9: | 0 |
7.0–7.9: | 1 |
6.0–6.9: | 3 |
Largest: | 7.5 Mw Mexico |
Fatalities: | 0 |
Date! rowspan="2" style="width: 310px"Country and location | Mw | Depth (km) | MMI | Notes | Casualties |
---|
Dead | Injured |
---|
[75] | | 6.0 | 35.0 | | | | |
[76] | | 7.5 | 25.0 | | | | |
[77] | | 6.8 | 35.0 | | | | |
[78] | Nicaragua, off the west coast | 6.5 | 30.0 | | | | | |
November
Month: | November |
8.0–8.9: | 0 |
7.0–7.9: | 0 |
6.0–6.9: | 5 |
Fatalities: | 0 |
Date! rowspan="2" style="width: 310px"Country and location | Mw | Depth (km) | MMI | Notes | Casualties |
---|
Dead | Injured |
---|
[79] | | 6.4 | 10.0 | | | | |
[80] | | 6.7 | 55.0 | | | | |
[81] | | 6.0 | 110.0 | | | | |
[82] | | 6.8 | 45.0 | | | | |
[83] | | 6.9 | 20.0 | | | | | |
December
Month: | December |
8.0–8.9: | 0 |
7.0–7.9: | 4 |
6.0–6.9: | 4 |
Largest: | 7.7 Mw Chile |
Deadliest: | 7.7 Mw Chile 279 deaths |
Fatalities: | 376 |
Date! rowspan="2" style="width: 310px"Country and location | Mw | Depth (km) | MMI | Notes | Casualties |
---|
Dead | Injured |
---|
[84] [85] | | 7.7 | 35.0 | | The 1928 Talca earthquake caused 279 deaths. Many homes were destroyed. | 279 | |
[86] | | 7.0 | 30.0 | | Aftershock. | | |
[87] | | 7.0 | 15.0 | | | | |
[88] | | 6.7 | 15.0 | | | | |
[89] | | 6.0 | 35.0 | | | | |
[90] | | 6.8 | 30.0 | | | | |
[91] [92] [93] | | 7.4 | 25.0 | | 97 people were killed due to the effects of the earthquake and a tsunami. 102 people were injured. Many homes collapsed. | 97 | 102 |
[94] | | 6.7 | 15.0 | | This occurred in a separate part of the island from the previous event. This is an example of remotely triggered earthquakes. | | | |
Notes and References
- Web site: On-Line Bulletin. International Seismological Centre. February 22, 2016 . January 1, 1928.
- Web site: On-Line Bulletin. International Seismological Centre. February 22, 2016 . January 5, 1928.
- Web site: M 7.0 - Kenya. United States Geological Survey. February 22, 2016 . January 6, 1928.
- Web site: M 6.2 - Kenya. United States Geological Survey. February 22, 2016 . January 10, 1928.
- Web site: M 6.3 - offshore Coquimbo, Chile. United States Geological Survey. February 22, 2016 . January 12, 1928.
- Web site: On-Line Bulletin. International Seismological Centre. February 24, 2016 . February 3, 1928.
- Web site: On-Line Bulletin. International Seismological Centre. February 24, 2016 . February 10, 1928.
- Web site: Significant Earthquake: MEXICO: OAXACA,COLIMA,PUEBLA,GUERRERO,MORELOS. National Geophysical Data Center. February 24, 2016 . February 10, 1928.
- Web site: M 6.6 - near the north coast of Chukotskiy Avtonomnyy Okrug, Russia. United States Geological Survey. February 24, 2016 . February 21, 1928.
- Web site: M 6.5 - near the north coast of Chukotskiy Avtonomnyy Okrug, Russia. United States Geological Survey. February 24, 2016 . February 26, 1928.
- Web site: On-Line Bulletin. International Seismological Centre. February 24, 2016 . March 7, 1928.
- Web site: Significant Earthquake: ITALY: SICILY,CALABRIA. National Geophysical Data Center. February 24, 2016 . March 7, 1928.
- Web site: M 6.2 - Gansu-Qinghai border region, China. United States Geological Survey. February 24, 2016 . March 7, 1928.
- Web site: Significant Earthquake: IRAN: NEHBANDAN. National Geophysical Data Center. February 24, 2016 . March 8, 1928.
- Web site: M 7.7 - South Indian Ocean. United States Geological Survey. February 24, 2016 . March 9, 1928.
- Web site: M 6.5 - New Ireland region, Papua New Guinea. United States Geological Survey. February 24, 2016 . March 13, 1928.
- Web site: M 7.6 - southeast of the Loyalty Islands. United States Geological Survey. February 24, 2016 . March 16, 1928.
- Web site: M 7.6 - Oaxaca, Mexico. United States Geological Survey. February 24, 2016 . March 22, 1928.
- Web site: M 6.2 - Molucca Sea. United States Geological Survey. February 24, 2016 . March 26, 1928.
- Web site: Significant Earthquake: ITALY: TOLMEZZO. National Geophysical Data Center. March 2, 2019 . March 27, 1928.
- Web site: M 7.0 - Izu Islands, Japan region. United States Geological Survey. February 24, 2016 . March 29, 1928.
- Web site: M 6.4 - western Turkey. United States Geological Survey. February 24, 2016 . March 31, 1928.
- Web site: Significant Earthquake: TURKEY: TEPEKOY, TORBALI. National Geophysical Data Center. February 24, 2016 . March 31, 1928.
- Web site: M 6.7 - central Peru. United States Geological Survey. February 27, 2016 . April 9, 1928.
- Web site: Significant Earthquake: PERU. National Geophysical Data Center. February 27, 2016 . April 9, 1928.
- Web site: Tsunami Event: S. PERU. National Geophysical Data Center. February 27, 2016 . April 9, 1928.
- Web site: M 7.1 - Bulgaria. United States Geological Survey. February 27, 2016 . April 14, 1928.
- Web site: Significant Earthquake: BULGARIA: CHIRPAN. National Geophysical Data Center. February 27, 2016 . April 14, 1928.
- Web site: M 6.5 - Veracruz, Mexico. United States Geological Survey. February 27, 2016 . April 17, 1928.
- Web site: M 7.1 - Bulgaria. United States Geological Survey. February 27, 2016 . April 18, 1928.
- Web site: Significant Earthquake: BULGARIA: POPOVITSA. National Geophysical Data Center. February 27, 2016 . April 18, 1928.
- Web site: On-Line Bulletin. International Seismological Centre. February 27, 2016 . April 22, 1928.
- Web site: Significant Earthquake: GREECE: CORINTH (CORINTHIA). National Geophysical Data Center. February 27, 2016 . April 22, 1928.
- Web site: M 6.5 - central Peru. United States Geological Survey. February 27, 2016 . April 27, 1928.
- Web site: Significant Earthquake: PERU: ESQUILAYA. National Geophysical Data Center. March 3, 2019 . April 27, 1928.
- Web site: On-Line Bulletin. International Seismological Centre. February 27, 2016 . May 8, 1928.
- Web site: On-Line Bulletin. International Seismological Centre. February 27, 2016 . May 14, 1928.
- Web site: Significant Earthquake: PERU: CHACAHPOYAS,HUANCABAMBA,CAJAMARCA,PINPINCOS. National Geophysical Data Center. February 27, 2016 . May 14, 1928.
- Web site: On-Line Bulletin. International Seismological Centre. February 27, 2016 . May 26, 1928.
- Web site: M 7.2 - near the east coast of Honshu, Japan. United States Geological Survey. February 27, 2016 . May 27, 1928.
- Web site: M 6.3 - off the east coast of Honshu, Japan. United States Geological Survey. March 2, 2016 . June 1, 1928.
- Web site: M 6.3 - northwest of the Ryukyu Islands, Japan. United States Geological Survey. March 2, 2016 . June 3, 1928.
- Web site: On-Line Bulletin. International Seismological Centre. March 2, 2016 . June 7, 1928.
- Web site: M 6.9 - Mindoro, Philippines. United States Geological Survey. March 2, 2016 . June 15, 1928.
- Web site: Significant Earthquake: PHILIPPINES: SW MINDORO. National Geophysical Data Center. March 2, 2016 . June 15, 1928.
- Web site: Tsunami Event: SULU SEA. National Geophysical Data Center. March 3, 2019 . June 15, 1928.
- Web site: M 6.7 - Mindoro, Philippines. United States Geological Survey. March 2, 2016 . June 15, 1928.
- Web site: M 8.0 - 15 km ESE of San Gabriel Mixtepec, Mexico. United States Geological Survey. March 2, 2016 . June 17, 1928.
- Web site: Significant Earthquake: MEXICO: OAXACA. National Geophysical Data Center. March 2, 2016 . June 17, 1928.
- Web site: Tsunami Event: S. MEXICO. National Geophysical Data Center. March 4, 2019 . June 17, 1928.
- Web site: M 6.7 - Fiji region. United States Geological Survey. March 5, 2016 . June 21, 1928.
- Web site: M 6.8 - Southern Alaska. United States Geological Survey. March 5, 2016 . June 21, 1928.
- Web site: On-Line Bulletin. International Seismological Centre. March 5, 2016 . June 24, 1928.
- Web site: M 7.1 - Vanuatu region. United States Geological Survey. March 5, 2016 . June 29, 1928.
- Web site: M 6.5 - Solomon Islands. United States Geological Survey. March 5, 2016 . July 9, 1928.
- Web site: On-Line Bulletin. International Seismological Centre. March 5, 2016 . July 18, 1928.
- Web site: Significant Earthquake: PERU. National Geophysical Data Center. March 5, 2019 . July 18, 1928.
- Web site: Significant Earthquake: CHINA: SICHUAN PROVINCE. National Geophysical Data Center. March 5, 2016 . July 19, 1928.
- Web site: On-Line Bulletin. International Seismological Centre. March 5, 2016 . July 27, 1928.
- Web site: On-Line Bulletin. International Seismological Centre. March 5, 2016 . July 28, 1928.
- Web site: M 7.2 - offshore Oaxaca, Mexico. United States Geological Survey. March 5, 2016 . August 4, 1928.
- Web site: On-Line Bulletin. International Seismological Centre. March 5, 2016 . August 5, 1928.
- Web site: On-Line Bulletin. International Seismological Centre. March 5, 2016 . August 10, 1928.
- Web site: M 6.3 - Molucca Sea. United States Geological Survey. March 5, 2016 . August 12, 1928.
- Web site: On-Line Bulletin. International Seismological Centre. March 5, 2016 . August 15, 1928.
- Web site: Significant Earthquake: IRAN: SHIRVAN. National Geophysical Data Center. March 5, 2016 . August 21, 1928.
- Web site: On-Line Bulletin. International Seismological Centre. March 5, 2016 . August 24, 1928.
- Web site: M 6.5 - Pakistan. United States Geological Survey. March 5, 2016 . September 1, 1928.
- Web site: M 6.2 - eastern New Guinea region, Papua New Guinea. United States Geological Survey. March 5, 2016 . September 7, 1928.
- Web site: M 6.5 - Molucca Sea. United States Geological Survey. March 5, 2016 . September 13, 1928.
- Web site: On-Line Bulletin. International Seismological Centre. March 5, 2016 . September 21, 1928.
- Web site: M 6.8 - Santa Cruz Islands. United States Geological Survey. March 5, 2016 . September 22, 1928.
- Web site: On-Line Bulletin. International Seismological Centre. March 5, 2016 . September 25, 1928.
- Web site: On-Line Bulletin. International Seismological Centre. March 5, 2016 . September 27, 1928.
- Web site: On-Line Bulletin. International Seismological Centre. March 6, 2016 . October 4, 1928.
- Web site: M 7.5 - Oaxaca, Mexico. United States Geological Survey. March 6, 2016 . October 9, 1928.
- Web site: M 6.8 - Pakistan. United States Geological Survey. March 6, 2016 . October 15, 1928.
- Web site: M 6.5 - near the coast of Nicaragua. United States Geological Survey. March 6, 2016 . October 25, 1928.
- Web site: M 6.4 - Chihuahua, Mexico. United States Geological Survey. March 6, 2016 . November 1, 1928.
- Web site: M 6.7 - Vanuatu. United States Geological Survey. March 6, 2016 . November 6, 1928.
- Web site: On-Line Bulletin. International Seismological Centre. March 6, 2016 . November 14, 1928.
- Web site: M 6.8 - Antofagasta, Chile. United States Geological Survey. March 6, 2016 . November 20, 1928.
- Web site: M 6.9 - Flores region, Indonesia. United States Geological Survey. March 6, 2016 . November 28, 1928.
- Web site: M 7.7 - Maule, Chile. United States Geological Survey. March 6, 2016 . December 1, 1928.
- Web site: Significant Earthquake: CHILE: TALCA, CHILLAN, SANTIAGO, SAN FERNANDO. National Geophysical Data Center. March 6, 2016 . December 1, 1928.
- Web site: M 7.0 - offshore Maule, Chile. United States Geological Survey. March 6, 2016 . December 2, 1928.
- Web site: M 7.0 - near the south coast of Papua, Indonesia. United States Geological Survey. March 6, 2016 . December 7, 1928.
- Web site: M 6.7 - Solomon Islands. United States Geological Survey. March 6, 2016 . December 9, 1928.
- Web site: On-Line Bulletin. International Seismological Centre. March 6, 2016 . December 10, 1928.
- Web site: M 6.8 - Kermadec Islands region. United States Geological Survey. March 6, 2016 . December 12, 1928.
- Web site: M 7.4 - Mindanao, Philippines. United States Geological Survey. March 6, 2016 . December 19, 1928.
- Web site: Significant Earthquake: PHILIPPINES: COTABATO,N COAST OF ILLANA BAY. National Geophysical Data Center. March 6, 2016 . December 19, 1928.
- Web site: Tsunami Event: CELEBES SEA. National Geophysical Data Center. March 6, 2016 . December 19, 1928.
- Web site: M 6.7 - Mindanao, Philippines. United States Geological Survey. March 6, 2016 . December 28, 1928.