The 2008 Ziarat earthquakes hit the Pakistani province of Balochistan on October 29 with a moment magnitude of 6.4. The US Geological Survey reported that the first earthquake occurred north of Quetta and southeast of the Afghanistan city of Kandahar at 04:09 local time (28 October, 23:09 UTC) at a depth of , at 30.653°N, 67.323°E. It was followed by another shallower magnitude 6.4 earthquake at a depth of approximately 12 hours after the initial shock, at 30.546°N, 67.447°E. 215 people were confirmed dead. More than 200 were injured (according to Mohammed Zaman, assistant to the Balochistan chief secretary, Nasir Khosa), and 120,000 were homeless (according to Dilawar Khan Kakar, Ziarat, Balochistan mayor and chief administrator). Qamar Zaman Chaudhry, director general of Pakistan Meteorological Department, stated the quake epicenter was north of Quetta, and about southwest of Islamabad.

Tectonic summary

Western and northern Pakistan lie across the complex plate boundary where the Indian Plate is

colliding In physics, a collision is any event in which two or more bodies exert forces on each other in a relatively short time. Although the most common use of the word ''collision'' refers to incidents in which two or more objects collide with great fo ...

with the Eurasian Plate. In this area the convergence is highly oblique, with the relative northward movement of the Indian Plate of 40 mm/yr (1.6 inches/yr) being at a low angle to the plate boundary. The main active faults are dominated by sinistral (left-lateral) strike-slip motion, with the Chaman Fault being the most important structure, accommodating a large proportion of the plate boundary displacement. The shortening component of the convergence is mainly accommodated by the Kirthar and

Sulaiman Sulaiman is an English transliteration of the Arabic name that means "peaceful" and corresponds to the Jewish name Hebrew: שְׁלֹמֹה‎, Shlomoh) and the English Solomon (/ˈsɒləmən/) . Solomon was the scriptural figure who was king of ...

fold and thrust belts. There is a sharp change in orientation of these two thrust belts near Quetta, known as the Quetta Syntaxis, where the north–south trending Kirthar ranges meet the west–east trending Sulaiman ranges. This area is the most seismically active part of this oblique segment of the plate margin, producing major earthquakes such as the 1935 Quetta event, which caused at least an estimated 30,000 deaths.

Earthquake sequence

The earthquake sequence began at 22:33 UTC on October 28, with a magnitude 5.3 foreshock. This was followed just over 30 minutes later at 23:09 by the first of the M 6.4 doublet earthquakes. The second M 6.4 doublet earthquake occurred at 11:32 on October 29. There were five significant aftershocks in the period up to December 12, including three M>5 earthquakes on that day. The observed

focal mechanism The focal mechanism of an earthquake describes the deformation in the source region that generates the seismic waves. In the case of a fault-related event it refers to the orientation of the fault plane that slipped and the slip vector and is ...

s were almost all

strike-slip In geology, a fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movements. Large faults within Earth's crust result from the action of plate tectonic ...

in type, but it remained unclear which faults ruptured during the sequence, with both southwest–northeast trending sinistral (left lateral) and northwest–southeast trending dextral (right lateral) faults being proposed. Investigations using InSAR data supported activity on multiple faults in both of these orientations.

Damage

Most of the casualties were from two villages on the outskirts of Ziarat town. Balochistan chief minister Nawab Aslam Khan Raisani ordered declaration of emergency in the hospitals of the affected areas. These areas, situated on steep terrain, were badly damaged by

landslide Landslides, also known as landslips, are several forms of mass wasting that may include a wide range of ground movements, such as rockfalls, deep-seated grade (slope), slope failures, mudflows, and debris flows. Landslides occur in a variety of ...

s caused by the quake. Hundreds of mud houses were destroyed. The tremors were felt in Quetta, Ziarat, Pishin, Qila Abdullah, Mastung, Sibi, Bolan, Kuchlak and

Loralai Loralai ( ps, لورلايي, ur, ), also known as Bori ( ps, ), is the division headquarter of Loralai Division and district headquarter of Loralai District. It is in the northeast of Balochistan province in Pakistan. It is above sea level. ...

areas.

Response

Dilawar Khan, mayor of Ziarat District, stated that his office had requested support from the local government. Pakistani military helicopters and troops were dispatched to assess damage and aid victims.

References

External links