Slip distribution along the North Anatolian fault associated with the large earthquakes of the period 1939 to 1967

Abstract Between 1939 and 1967, six large fault ruptures formed a westward-migrating sequence of events along a 900-km-long nearly continuous portion of the North Anatolian fault. For these events—the 1939 Erzincan, 1942 Niksar-Erbaa, 1943 Tosya, 1944 Bolu-Gerede, 1957 Abant, and 1967 Mudurnu Valley earthquakes—I have compiled a record of dextral slip, which contains nearly 100 points. These data indicate that the amount of slip is irregularly distributed along the 1939 to 1967 rupture zone. The maximum slip, 7.5 m, occurred during the 1939 earthquake in the eastern 150 km of the 900-km-long rupture zone. Dextral offsets diminish very abruptly eastward but very gradually westward. The rate of westward decrease in the 1939 to 1967 offsets is only slightly greater than the rate of westward decrease of post-Miocene displacement along the North Anatolian fault. This suggests that westward decrease in slip can be expected to be a general characteristic of earthquake ruptures along the North Anatolian fault in the future. Nevertheless, within the 1939 to 1967 slip distribution, there are three regions that had less slip than the neighboring regions. These I interpret as possible sites of large future earthquakes. One of these seismic gaps has already experienced another earthquake (in 1951) and subsequent creep.

[1]  N. N. Ambraseys,et al.  The seismicity of Turkey and adjacent areas: A historical review, 1500-1800 , 1995 .

[2]  K. Aki.  Scaling Law of Earthquake Source Time-Function , 1972 .

[3]  D. P. Schwartz,et al.  Fault behavior and characteristic earthquakes: Examples from the Wasatch and San Andreas Fault Zones , 1984 .

[4]  P. Hancock,et al.  Neotectonic deformation patterns in the convex-northwards arc of the North Anatolian fault zone , 1984, Geological Society, London, Special Publications.

[5]  N. N. Ambraseys,et al.  Some characteristic features of the Anatolian fault zone , 1970 .

[6]  Kerry E Sieh,et al.  Slip along the San Andreas fault associated with the great 1857 earthquake , 1984 .

[7]  David R. Brillinger,et al.  A more precise chronology of earthquakes produced by the San Andreas fault in southern California , 1989 .

[8]  I. Ketin.  Über die tektonisch-mechanischen Folgerungen aus den großen anatolischen Erdbeben des letzten Dezenniums , 1948 .

[9]  James Jackson,et al.  The relationship between plate motions and seismic moment tensors, and the rates of active deformation in the Mediterranean and Middle East , 1988 .

[10]  Vít Kárník,et al.  Seismicity of the European area , 1971 .

[11]  D. McKenzie.  Active Tectonics of the Mediterranean Region , 1972 .

[12]  J. Dewey.  Seismicity of Northern Anatolia , 1976, Bulletin of the Seismological Society of America.

[13]  S. Riad,et al.  Earthquake catalog for the Middle East countries 1900-1983 , 1985 .

[14]  C. Scholz.  The Mechanics of Earthquakes and Faulting , 1990 .

[15]  A. Aytun.  Creep Measurements in the Ismetpaşa Region of the North Anatolian Fault Zone , 1982 .

[16]  K. Sieh.  Lateral offsets and revised dates of large prehistoric earthquakes at Pallett creek, Southern California , 1984 .

[17]  C. R. Allen,et al.  Segmentation and Recent rupture history of the Xianshuihe Fault, Southwestern China , 1989 .

[18]  A. Koçyi̇ği̇t.  SUSEHRI BASIN - AN ACTIVE FAULT-WEDGE BASIN ON THE NORTH ANATOLIAN FAULT ZONE, TURKEY , 1989 .

[19]  James Jackson,et al.  Active tectonics of the north and central Aegean Sea , 1991 .

[20]  A. Barka,et al.  Strike‐slip fault geometry in Turkey and its influence on earthquake activity , 1988 .

[21]  N. Ambraseys.  The Anatolian earthquake of 17 August 1668. , 1988 .

[22]  H. N. Pamir,et al.  Das anatolische Erdbeben Ende 1939 , 1941 .

[23]  M. N. Toksöz,et al.  Space-time migration of earthquakes along the North Anatolian fault zone and seismic gaps , 1979 .

[24]  N. N. Ambraseys,et al.  The Mudurnu Valley, West Anatolia, Turkey, earthquake of 22 July 1967 , 1969 .