1968 Dasht-e Bayaz and Ferdows earthquakes
UTC time | 1968-08-31 10:47:43 |
---|---|
ISC event | 818488 |
USGS-ANSS | ComCat |
Local date | August 31, 1968 |
Local time | 14:17:43 |
Duration | 1–2 minutes [1] |
Magnitude | 7.1 Mw[2] |
Epicenter | 34°01′N 58°58′E / 34.02°N 58.96°E |
Areas affected | Iran |
Max. intensity | MMI X (Extreme) [1] |
Aftershocks | 6.4 Mw Sept 1 at 07:27 [3] |
Casualties | 15,000 August 31 [4] 900 September 1 [4] |
The Dasht-e Bayaz and Ferdows earthquakes (Persian: زمینلرزه ۱۳۴۷ دشت بیاض و زمین لرزه فردوس) occurred in Dashte Bayaz, Kakhk and Ferdows, Iran in late August and early September 1968. The mainshock measured 7.4 on the moment magnitude scale and had a maximum perceived intensity of X (Extreme) on the Mercalli intensity scale. Damage was heavy in the affected areas with thousands of lives lost in the first event and many hundreds more in the second strong event.
Tectonic setting
The
In eastern Iran, the shortening is accommodate by a combination of relatively short northwest–southeast trending reverse faults, long north–south trending right lateral strike-slip faults and shorter west–east trending left-lateral strike-slip faults.[2]
Earthquakes
The first earthquake occurred on August 31, 1968, measuring 7.1 on the moment magnitude scale. The focal mechanism indicated strike-slip faulting and the observed 80 km surface rupture showed that this earthquake resulted from movement on the western part of the west–east trending left-lateral Dasht-e-Bayaz Fault. The greatest observed left-lateral coseismic offset was about 4.5 m, with 2 m being the average observed offset.[2] The western end of the Dasht-e-Bayaz Fault ruptured and produced another large earthquake in 1979.[6]
Damage
The mainshock destroyed five villages in the Dasht-e Bayaz area, and at least half of the buildings in another six villages from Kakhk to Sarayan. A strong aftershock on September 1, measuring 6.4 on the moment magnitude scale, destroyed Ferdows. More than 175 villages were destroyed or damaged in this earthquake.
See also
References
- ^ ]
- ^ .
- ISBN 978-0521021876
- ^ ISBN 978-0124406520
- doi:10.1785/BSSA0890010120, archived from the originalon January 10, 2012
- doi:10.1111/j.1365-246X.2011.05213.x.)
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: CS1 maint: multiple names: authors list (link
Further reading
- Ambraseys, N.; Tchalenko, J. S. (1969), "The Dasht-e Bayāz (Iran) earthquake of August 31, 1968: A field report", Bulletin of the Seismological Society of America, 59 (5): 1751–1792,
- Crampin, S. (1969), "Aftershocks of the Dasht-e Bayāz, Iran, earthquake of August, 1968", Bulletin of the Seismological Society of America, 59 (5): 1823–1841, doi:10.1785/BSSA0590051823, archived from the originalon 2014-12-02, retrieved 2014-09-06
External links
- Earthquakes with 1,000 or More Deaths since 1900 – United States Geological Survey
- The International Seismological Centre has a bibliography and/or authoritative data for this event.