1997 Qayen earthquake
The Qayen earthquake struck northern Iran’s Khorasan Province in the vicinity of Qaen on May 10, 1997 at 07: 57 UTC. The earthquake registered 7. 3 on the moment magnitude scale and was centered approximately 270 kilometers south of Mashhad on the village of Ardekul. It devastated the Birjand–Qayen region, killing 1,567 and injuring more than 2,300. Damage was eventually estimated at $100 million.
About 1997 Qayen earthquake in brief
The Qayen earthquake struck northern Iran’s Khorasan Province in the vicinity of Qaen on May 10, 1997 at 07: 57 UTC. The largest in the area since 1990, the earthquake registered 7. 3 on the moment magnitude scale and was centered approximately 270 kilometers south of Mashhad on the village of Ardekul. It devastated the Birjand–Qayen region, killing 1,567 and injuring more than 2,300. The earthquake was later discovered to have been caused by a rupture along a fault that runs underneath the Iran–Afghanistan border. Damage was eventually estimated at USD 100 million, and many countries responded to the emergency with donations of blankets, tents, clothing, and food. Iran experiences regular earthquakes, with 200 reported in 1996 alone. With 1 in 3,000 deaths in Iran attributable to earthquakes, a US geophysicist has suggested that a country-wide rebuilding program would be needed to address the ongoing public safety concerns. The destruction around the earthquake’s epicenter was, in places, almost total; this has been attributed to poor construction practices in rural areas, and imparted momentum to a growing movement for changes in building codes for earthquake-safe buildings.
The maximum horizontal acceleration during the quake was approximately 6. 9 meters per second—nearly three-quarters of the acceleration an object would have in free fall—and occurred near the epicenter. Many of the aftershocks occurred along the rupture up to 24 kilometers below the surface. The quake was felt over an area of 500,000 square kilometers, including in Mashhad, Kerman and Yazd. The inhabitants of the poverty-stricken region rely on subsistence farming, raising livestock and crops such as wheat and saffron. When the earthquake struck, most of the population was already working in the fields; much of these people survived and were found to be undernourished. The main climate-resistant homes in the region are instead constructed of adobe-style adobe buildings. Although the Iranian government had distributed more than 800 seismographs throughout the country, few had been placed in the Qayan region due to its remoteness and the dry desert climate. The most severe tremors were felt within a 100-kilometer strip between the epicentre and Bir jand. The damage was estimated at $100 million.
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