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1963 was a medium magnitude (31 = 5.8) shock which belongs to the series
of earthquakes that began in 1909 and which lias successively delineated a
zone of seismic activity about 300 kilometres long. The meizoseismal area
of the Karkhaneh earthquake lies between and overlaps the meizoseismal areas
of the earthquakes of 1957 and 1958, tlius filling a gap of low seismic activity
since 1958. The earthquake destroyed 4,000 houses in 22 villages, injuring
about 50 people. Its meizoseismal area did not exceed 300 square kilometres.
The felt area was comparatively large, about 45,000 square kilometres
and the predominant epicentral intensity was VI to V I I (MM). The earthquake,
which was followed by a dozen strong aftershocks, caused considerable
ground deformations along the Kangavar valley which run for at least 8
kilometres parallel with and to the northwest of the Kurram river. There is
no evidence that these deformations are of tectonic origin.
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