1979 Ghaenat earthquakes
Strike-slip | |
Areas affected | Iran |
---|---|
Max. intensity | MMI X (Extreme) |
Aftershocks | Many. Largest is a Ms 6.0 |
Casualties | 297–440 dead, 279 injured |
The 1979 Ghaenat earthquakes were a series of large earthquakes in
Tectonic setting
Iran is situated within the
Earthquakes
The earthquake of November 27 was the strongest in the area since 1968. Between 1968 and 1979, the area was hit by strong earthquakes including a Mw 6.0 in 1976. Another large Ms 6.7 or Mw 6.5 shock on January 16, 1979, killing 200 people in the town of Bonzonabad.[4][7] The source fault of that event has not been identified yet although the Boznabad and Pavak faults were possible candidates.[8]
Korizan earthquake
The Ms 6.6 or Mw 6.8 earthquake of November 14 was the result of rupturing the Abiz Fault,
Koli-Boniabad earthquake
The November 27 Ms 7.1 mainshock occurred as a result of strike-slip faulting for a length of 60 km (37 mi) along the left-lateral Dasht-e-Bayaz Fault. It had an estimated moment magnitude (Mw ) of 7.1–7.2.[6] This mainshock had a hypocenter depth of 7.9 km (4.9 mi).[1] The second rupture is nearly perpendicular to the prior rupture.[6] The same fault produced another deadly Ms 7.1 earthquake in 1968 to the west northwest. The 1968 earthquake ruptured the western section for the fault for about 80 km (50 mi) in length. At least 10 km (6.2 mi) of the 1968 rupture was involved in the 1979 event. The both earthquakes displayed strike-slip focal mechanisms.[13]
A maximum vertical surface displacement of 3.90 m (12.8 ft), and horizontal surface displacement of 2.55 m (8 ft 4 in) was measured, respectively. The
Kalat-e-Shur earthquake
Another earthquake measuring Ms 6.0 or Mw 6.1[15] on December 7 was initially thought to have caused a 15 km (9.3 mi) long surface rupture to the north. The aftershock would have extended the rupture length of the Abiz Fault to a total of 35 km (22 mi), but these ruptures may have also formed during a subevent of the Mw 7.2 shock. It is unlikely that the 15 km (9.3 mi) of new surface ruptures were attributed to the Mw 5.9 mainshock, due to its moderate magnitude. The earthquake has been suggested to be on a separate north–south striking structure, away from the Abiz Fault.[13]
Impact
The earthquake damaged or destroyed mainly
Between 280 and 420 people died, with a further 279 injured in the November 14 earthquake.[17] Many villages were also badly damaged in the earthquake. The earthquake struck at 5:51 local time (IST) when many adult villagers were outside their homes harvesting saffron. Most of the dead were reportedly young children left at home while their adult family members were working in the saffron fields.[16]
The second earthquake destroyed 10 villages.[4] Survivors of the earthquakes were relocated to other areas while some damaged villages were rebuilt by the government in the same place.[18] The second mainshock only resulted in 20 additional deaths and injured 24 people. The death toll from the second earthquake was smaller due to the low population density of the area when the quake struck.[19]
See also
References
- ^ a b "International Seismological Centre Online Event Bibliography". ISC: On-Line Bulletin. International Seismological Centre. Retrieved 4 August 2021.
- ^ National Earthquake Information Center. "M 7.1 - 56 km ENE of Q?'en, Iran". United States Geological Survey. Retrieved 4 August 2021.
- ^ S2CID 239771196.
- ^ doi:10.7289/V5TD9V7K. Retrieved 4 August 2021.
- ^ Carl W. Stover; Carl A. von Hake (1984). United States earthquakes, 1979, 1984, Open-File Report 84-979 (PDF). U.S. Geological Survey. pp. 138–140.
- ^ a b c Niazi, Mansour; Kanamori, Hiroo (1981). "Source parameters of 1978 Tabas and 1979 Qainat, Iran earthquakes from long-period surface waves" (PDF). Bulletin of the Seismological Society of America. 71 (4): 1201–1213.
- ^ National Earthquake Information Center. "M 6.7 - 32 km NE of Q?'en, Iran". United States Geological Survey. Retrieved 4 August 2021.
- S2CID 133502859.
- ^ .
- ^ "International Seismological Centre Online Event Bibliography". ISC: On-Line Bulletin. International Seismological Centre. Retrieved 4 August 2021.
- S2CID 128583149.)
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- ^ .
- S2CID 128583149.
- ^ National Earthquake Information Center. "M 6.0 - 67 km ENE of Q?'en, Iran". United States Geological Survey. Retrieved 13 December 2022.
- ^ .
- ^ "Korizan-Khaf Earthquake of 14 November 1979, Ms6.6". Institute of Engineering Seismology and Earthquake Engineering. 14 November 2015. Retrieved 4 August 2021.
- ^ Reza Alaghebandian (1998). "Damage of Reinforced Concrete Frame Structures during the Iran-Qayen (Ardakul) Earthquake of May 10, 1997". Annual Papers on Concrete Engineering. 20 (3). Japan Concrete Engineering Association.
- ^ "زمین لرزه ۶ آذر ۱۳۵۸ (۲۷ نوامبر ۱۹۷۹) کولی-بنیاباد" (in Persian). Institute of Engineering Seismology and Earthquake Engineering. Retrieved 4 August 2021.