1975 Lice earthquake

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1975 Lice earthquake
Turkey relief location map.jpg
Bullseye1.png
UTC  time1975-09-06 09:20:13
ISC  event 723680
USGS-ANSS ComCat
Local date6 September 1975 (1975-09-06)
Local time12:20
Magnitude6.7 Ms
Depth26 km
Epicenter 38°28′26″N40°43′23″E / 38.474°N 40.723°E / 38.474; 40.723 [1]
Areas affected Turkey
Max. intensity MMI VIII (Severe)
Casualties2,311 dead

The 1975 Lice earthquake struck the Turkish district of Lice at 12:20 local time (09:20 UTC) on 6 September. The epicenter of the Ms 6.7 shock was located near the town of Lice and the maximum felt intensity was VIII (Severe) on the Mercalli intensity scale. [1] More than 2,300 people were killed.

Contents

Tectonic setting

The tectonics of Turkey are dominated by the effects of the continuing collision between the African plate and the Eurasian plate. The main result of this collision is the southwestward escape of the Anatolian Plate by displacement along the North Anatolian and East Anatolian Faults. To the east of these faults, the plate boundary is a zone of orthogonal collision, with the relative displacement spread out over a wide zone, continuing as far north as the Greater Caucasus. The largest fault within the plate boundary zone is the west–east trending Bitlis frontal thrust and the 1975 earthquake is thought to have been caused by movement on this structure. [2]

Earthquake characteristics

The mainshock was followed by aftershocks that continued for more than a month. The focal mechanism for the earthquake suggests that it was associated with dominantly reverse movement on a fault plane dipping at 45° to the northwest with a significant sinistral (left lateral) component. [3] Ground deformations were mapped; surface fracturing measuring 17–19 cm (6.7–7.5 in) and left-lateral offsets measuring 13–14 cm (5.1–5.5 in). These deformations were not interpreted as surface ruptures. [4]

Impact

The maximum observed Modified Mercalli intensity was VIII assigned in Lice and the surrounding area in an east–west trend. Maximum damage occurred in a 4,000 km2 (1,500 sq mi) area. [5] Seismic shaking lasted for about 20–24 seconds. [6] The main area of damage was located near the towns of Hani, Lice and Kulp. In Lice 12 out of the 13 mahalles (sections) of the town were completely destroyed. Six schools, 6 mosques and 132 commercial buildings were damaged. In the 188 villages surrounding Lice that were affected, 5,555 houses suffered either severe damage or total destruction. [6] The New York Times reported, citing the governor of Diyarbakır, on 7 September that 75 percent of the town's buildings were demolished. At Palu, Elazig Province, the earthquake destroyed 65 buildings and a mosque. [7]

Response

National

The Turkish Red Crescent established two emergency kitchens, one medical team, tents, blankets and other necessities. Rescue teams dug through rubble during the first night after the earthquake. [7]

A total of 15,000 Turkish soldiers were involved in rescue and relief work, with the first personnel arriving just 3 hours after the earthquake. The government set aside a total of 34 million dollars for repair and reconstruction. [6] On 10 September, the government of Turkey announced they would provide earthquake-resistant homes for the affected residents after being persuaded by opposition political parties, newspapers and Kurdish-minority militants. Süleyman Demirel, then Turkey's prime minister, said they planned to construct 3,000 new homes away from the devastated hillside community. [8]

Just 5 days after the earthquake, following a geological site investigation of suitable sites, the decision was made to relocate the town about 2 km (1.2 mi) south of its previous position. By 29 October 1975, 1,568 houses, 40 shops, a school, a mosque and a bakery were complete. [6]

International

Financial assistance from the international community, from both government and private sources reached a total of $14,837,058. The largest government contribution was from Saudi Arabia. Aid in the form of food and some other supplies from foreign agencies were treated with suspicion with much unfamiliar tinned food being sold for animal feed. [6]

See also

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References

  1. 1 2 NGDC. "Comments for the Significant Earthquake" . Retrieved 27 August 2010.
  2. ↑ Barka, A.; Reilinger R. (1997). "Active tectonics of the Eastern Mediterranean region: deduced from GPS, neotectonic and seismicity data". Annali di Geofisica. 40 (3): 587–610. Retrieved 2 October 2010.
  3. ↑ Moazami-Goudarzi, K.; Akasheh B. (1977). "The earthquake of September 6, 1975, in Lice (eastern Turkey)". Tectonophysics. 40 (3–4): 361–368. Bibcode:1977Tectp..40..361M. doi:10.1016/0040-1951(77)90074-9.
  4. ↑ Seyi̇toğlu, G.; Esat, K.; Kaypak, B. (2017). "The neotectonics of southeast Turkey, northern Syria, and Iraq: the internal structure of the Southeast Anatolian Wedge and its relationship with recent earthquakes". Turkish Journal of Earth Sciences. 26 (2): 105–126. doi: 10.3906/yer-1605-21 .
  5. ↑ Akasheh, B.; Moazami-Goudarzi, K. (1977). "The earthquake of September 6, 1975 in Lice (eastern Turkey)". Tectonophysics. 40 (3–4): 361–368. Bibcode:1977Tectp..40..361M. doi:10.1016/0040-1951(77)90074-9.
  6. 1 2 3 4 5 Mitchell, W.A. (1977). "Partial recovery and reconstruction after disaster: the Lice case" (PDF). Mass Emergencies. 2 (4): 233–247. Archived from the original (PDF) on 2011-07-27. Retrieved 2 October 2010.
  7. 1 2 "Big Earthquake in Turkey Leaves at Least 1,000 Dead". The New York Times. 7 September 1975. Retrieved 20 October 2023.
  8. ↑ Pace, Eric (11 September 1975). "After Protests, Turkey Steps Up Assistance to Quake Victims". The New York Times. Retrieved 20 October 2023.
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