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1967 Mudurnu earthquake

Earthquake in western Turkey

Field	Value
title	1967 Mudurnu earthquake
timestamp	1967-07-22 16:57:00
isc-event	833573
anss-url	iscgem833573
local-date
local-time	18:57
map2	{{Location map	Turkey	relief=1
lat	40.67
long	30.69
mark	Bullseye1.png
marksize	40
position	top
width	250
float	right
caption	}}
depth	33.0 km
location
type	Oblique slip
magnitude	7.4
7.1 {{M	s	link	y}}
intensity
countries affected	Turkey
casualties	86 dead

|isc-event = 833573 |anss-url = iscgem833573 |local-date = |local-time = 18:57 7.1

The 1967 Mudurnu earthquake or more correctly, the 1967 Mudurnu Valley earthquake occurred at about 18:57 local time on 22 July near Mudurnu, Bolu Province, north-western Turkey. The magnitude 7.4 earthquake (but only 6.0 on the scale.) was one of a series of major and intermediate quakes that have occurred in modern times along the North Anatolian Fault since 1939.

Earthquake

Although the Mudurnu Valley earthquake was relatively strong, there were only 86 fatalities, with 332 people injured. About 5,200 houses were destroyed or damaged beyond repair; . some 900 of these were in Adapazarı at the far western end of the fault zone, and many collapsed completely as a result of aftershocks.

Intensity

The authors of the 1968 UNESCO report into the Mudurnu Valley earthquake, with Nicholas Ambraseys as its first author, felt that its Mercalli intensity was difficult to estimate accurately. In some places an implied level of XII (Extreme) was evident, whereas the vibrational effects were nearer VIII–IX (Severe–Violent). Although a large number of sites were independently assessed by up to six observers, variations of up to four degrees of the Mercalli scale indicated that an accurate figure was practically impossible to gauge. A 1988 paper authored by Ambraseys lists the event with a maximum Mercalli intensity of X (Extreme).

Damage

Considering the large surface-wave magnitude (7.1) and widespread surface rupturing, structural damage to buildings was surprisingly small; variations in damage were related to the materials used and construction method of individual buildings, rather than the proximity to the fault break. Some villages suffered 70% destruction of property, while others nearby with fault lines running right through them had only a few houses damaged.

Surface rupture

The surface rupture zone, which was between 1 - wide, stretched some 80 km from to Lake Abant () to Sapanca in an East–West direction, generally following the course of the Mudurnu River until it flows north near Lake Sapanca. The earthquake is named after the river valley, not the town of Mudurnu itself, which is some distance south of the river and outside the rupture zone.

Aftershocks

A number of small aftershocks occurred, mostly towards the westward end of the fault zone; its eastern end overlapped the rupture zone of the previous M7.1 1957 Abant earthquake with a similar epicentre, by about 25 km.

References

Sources

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References

{{Short-isc. EHB. 833573
{{Short-isc. EHB. 833573
{{Short-anss. Mudurnu. 1967
{{Harvnb. Ambraseys. Zápotek. Taşdemiroğlu. Aytun. 1968
{{Harvnb. Ambraseys. Zápotek. Taşdemiroğlu. Aytun. 1968
{{Short-anss. Mudurnu. 1967
{{Short-isc. EHB. 833573 The difference is due to differences in what each scale measures.
{{Harvnb. Toksöz. Shakal. Michael. 1979
{{Harvnb. Ambraseys. Zápotek. Taşdemiroğlu. Aytun. 1968
{{Harvnb. Ambraseys. Zápotek. Taşdemiroğlu. Aytun. 1968
{{Harvnb. Ambraseys. Zápotek. Taşdemiroğlu. Aytun. 1968
{{Harvnb. Toksöz. Shakal. Michael. 1979. Ambraseys. Zápotek. Taşdemiroğlu. Aytun. 1968
Ambraseys, N. N.. (1988). "Engineering seismology: Part I". Earthquake Engineering & Structural Dynamics.

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This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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