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| ==Earthquake== | ==Earthquake== | ||
| Three historical earthquakes were documented near the Main Recent Fault. Two earthquakes in May 912 and April 1008 occurred near the former settlement of ] while a third occurred to the southeast of ] before 1889. The first two earthquakes brought heavy damage and casualties in Dinawar. Historic records of the 912 earthquake says a "mountain split open" and water gushed out, sinking many settlements. Ground cracks, possibly assocated with tectonic origins was documented during the 1008 event. The Main Recent Fault was also associated with the {{M|s}} 7.4 earthquake in 1909 which produced more than {{cvt|40|km}} of surface rupture.<ref name="Tchalenko" /> | Three historical earthquakes were documented near the Main Recent Fault. Two earthquakes in May 912 and April 1008 occurred near the former settlement of ] while a third occurred to the southeast of ] before 1889. The first two earthquakes brought heavy damage and casualties in Dinawar. Historic records of the 912 earthquake says a "mountain split open" and water gushed out, sinking many settlements. Ground cracks, possibly assocated with tectonic origins was documented during the 1008 event. The Main Recent Fault was also associated with the {{M|s}} ] which produced more than {{cvt|40|km}} of surface rupture.<ref name="Tchalenko" /> | ||
| Seismicity along the Main Recent Fault was nearly absent for nearly 50 years since 1909. In December 1955, an earthquake near ] caused rockfalls and three deaths. A single foreshock was felt 26 hours before the mainshock. The mainshock was followed by 32 aftershocks within a month of its occurrence. Its epicenters were instrumentally recorded and located, revealing a northeast—southwest trend intersecting the Main Recent Fault (also perpenticular to the axis of ]).<ref name="Tchalenko" /> Ground deformations including rockfalls and fractures occurred, associated with the mainshock and aftershocks, but there was inconclusive evidence to show that these were of tectonic origin.<ref name="AMBRASEYS">{{cite journal |last1=Ambraseys |first1=N. N. |last2=Moinfar |first2=A. A. |last3=Peronaci |first3=P. |title=The Seismieity of Iran the Farsinaj (Kermanshah) earthquake of 13 December 1957 |journal=Annals of Geophysics |date=1973 |volume=26 |issue=4 |doi=10.4401/ag-5030 |url=https://www.annalsofgeophysics.eu/index.php/annals/article/view/5030}}</ref> | Seismicity along the Main Recent Fault was nearly absent for nearly 50 years since 1909. In December 1955, an earthquake near ] caused rockfalls and three deaths. A single foreshock was felt 26 hours before the mainshock. The mainshock was followed by 32 aftershocks within a month of its occurrence. Its epicenters were instrumentally recorded and located, revealing a northeast—southwest trend intersecting the Main Recent Fault (also perpenticular to the axis of ]).<ref name="Tchalenko" /> Ground deformations including rockfalls and fractures occurred, associated with the mainshock and aftershocks, but there was inconclusive evidence to show that these were of tectonic origin.<ref name="AMBRASEYS">{{cite journal |last1=Ambraseys |first1=N. N. |last2=Moinfar |first2=A. A. |last3=Peronaci |first3=P. |title=The Seismieity of Iran the Farsinaj (Kermanshah) earthquake of 13 December 1957 |journal=Annals of Geophysics |date=1973 |volume=26 |issue=4 |doi=10.4401/ag-5030 |url=https://www.annalsofgeophysics.eu/index.php/annals/article/view/5030}}</ref> | ||
Revision as of 04:05, 5 December 2022
Natural disaster in Iran   Tehran | |
| UTC time | 1957-12-13 01:45:04 |
|---|---|
| ISC event | 887684 |
| USGS-ANSS | ComCat |
| Local date | December 13, 1957 (1957-12-13) |
| Magnitude | 6.5 Mw |
| Depth | 15 km (9 mi) |
| Epicenter | 34°23′17″N 47°44′53″E / 34.388°N 47.748°E / 34.388; 47.748 |
| Type | Strike-slip |
| Areas affected | Iran |
| Max. intensity | MMI VII (Very strong)+ |
| Casualties | 1,130 killed |
The 1957 Farsinaj earthquake struck Hamadan, Iran on 13 December at 05:15 local time. The moment magnitude 6.5 earthquake destroyed 211 villages, killed approximately 1,130 people, and left another 900 injured.
Tectonic setting
The Zagros Mountains stretching from Turkey to the Gulf of Oman, through Iran and Iraq for 1,500 km (930 mi) formed from continental collision involving the Arabian Plate and Central Iran. Its formation occurred during the late-Triassic, late-Jurassic, late-Cretaceous, Oligocene and Pliocene. During its early formation, some extensional tectonics is believed to have occurred. The mountain range is still accommodating deformation, evident in the present-day seismicity. Deformation is accommodated by thrust and strike-slip faulting within the range. Parallel to major thrust faults of the mountains is the Main Recent Fault, an active right-lateral strike-slip fault.
Earthquake
Three historical earthquakes were documented near the Main Recent Fault. Two earthquakes in May 912 and April 1008 occurred near the former settlement of Dinavar while a third occurred to the southeast of Dorud before 1889. The first two earthquakes brought heavy damage and casualties in Dinawar. Historic records of the 912 earthquake says a "mountain split open" and water gushed out, sinking many settlements. Ground cracks, possibly assocated with tectonic origins was documented during the 1008 event. The Main Recent Fault was also associated with the Ms 7.4 earthquake in 1909 which produced more than 40 km (25 mi) of surface rupture.
Seismicity along the Main Recent Fault was nearly absent for nearly 50 years since 1909. In December 1955, an earthquake near Razan caused rockfalls and three deaths. A single foreshock was felt 26 hours before the mainshock. The mainshock was followed by 32 aftershocks within a month of its occurrence. Its epicenters were instrumentally recorded and located, revealing a northeast—southwest trend intersecting the Main Recent Fault (also perpenticular to the axis of meizoseismal area). Ground deformations including rockfalls and fractures occurred, associated with the mainshock and aftershocks, but there was inconclusive evidence to show that these were of tectonic origin.
Damage and casualties
A site investigation by Nicholas Ambraseys and other researchers revealed serious damage over a 2,800 km (1,100 sq mi) area. The earthquake lasted 10 seconds and was felt for 180,000 km (69,000 sq mi). Damage was greatest in the northeast than southwest due to the direction that seismic energy radiated. At least 1,130 people died, 900 were injured, and 15,000 became homeless—at least 20,000 animals also died. At Farsinaj, 703 people, or about half the population, perished, and only 30 homes were left intact. The village was reconstructed 1 km (0.62 mi) away from the ruins. At Dehasiyab, 34 people died and 23 were injured—the village was razed and reconstructed several hundred meters away. Six people died, 20 were injured and two-thirds of homes in Sollantaher were destroyed. No serious damage occurred outside the 15 km (9.3 mi) radius around Farsinaj, and at Sonqor, only cracks appeared in buildings. In two villages north of Farsinaj, the death toll totaled 63. In the epicenter area, the seismic intensity was considered modest, assigned VII+ on the Modified Mercalli intensity scale. The mainshock and its aftershocks heavily damaged or destroyed 5,000 of the 9,000 homes in the area. Most homes were constructed of single-storey adobe or rubble masonry materials held together by mud, and heavy roofs from tampered earth. Some villages had double-storey adobe and single-storey brick homes with jack arches or iron sheets. The area of maximum damage occurred between Kangavar and Farsinaj, and the most affected areas were north of Sahneh. The severity of damage became inconsistent and repidly fell to the south. At Sarab, the village was heavily damaged and 53 residents died, whereas at Sahneh, Gakul and Bisitun, damage was moderate. Northwest of Sahneh the mainshock produced cracks in the ground. Rockfalls and disruption of a natural spring was also recorded. Aftershocks on 13 and 18 December near Kangavar and Firuzabad on 28 December caused further damage. The aftershock on 14 December caused more than 20 deaths and left 50 injured. Another aftershock on the same day at Najafabad killed one and injured four, and destroyed more buildings. Fourteen people died in an aftershock on 18 December at Fash. An additional 20 people and more animals died from a snow storm on 21 December. On 31 December, another aftershock killed three at Kangavar.
See also
References
- ^ ISC (27 June 2022), ISC-GEM Global Instrumental Earthquake Catalogue (1900–2009), Version 9.1, International Seismological Centre
- National Geophysical Data Center / World Data Service (NGDC/WDS) (1972), Significant Earthquake Database (Data Set), National Geophysical Data Center, NOAA, doi:10.7289/V5TD9V7K
- ^ Tchalenko, J. S.; Braud, J. (1974). "Seismicity and structure of the Zagros (Iran): the Main Recent Fault between 33 and 35° N". Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences. 277: 1–25. doi:10.1098/rsta.1974.0044.
- ^ Ambraseys, N. N.; Moinfar, A. A.; Peronaci, P. (1973). "The Seismieity of Iran the Farsinaj (Kermanshah) earthquake of 13 December 1957". Annals of Geophysics. 26 (4). doi:10.4401/ag-5030.
- "Farsinaj Earthquake of 13 December 1957, Ms7.1". International Institute of Earthquake Engineering and Seismology. Retrieved 5 December 2022.
| Earthquakes in the 1950s | |
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| 1952 |
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| 1953 |
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| 1954 |
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| 1956 |
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| 1957 |
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| 1958 |
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| 1959 |
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| † indicates earthquake resulting in at least 30 deaths ‡ indicates the deadliest earthquake of the year | |