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Rupture characteristics of the A.D. 1912 Murefte (Ganos) earthquake segment of the North Anatolian Fault (western Turkey)

Murat Ersen Aksoy, Mustapha Meghraoui, Martin Vallee and Ziyadin Cakir
Rupture characteristics of the A.D. 1912 Murefte (Ganos) earthquake segment of the North Anatolian Fault (western Turkey)
Geology (Boulder) (November 2010) 38 (11): 991-994

Abstract

The Ganos fault is the westernmost segment of the North Anatolian fault that generated the 9 August 1912 Murefte (Ganos) earthquake in western Turkey (M (sub w) =7.4). We study the 1912 earthquake characteristics using coseismic fault slip and fault segmentation coupled with an analysis of historical seismic records. Surface ruptures with small releasing and restraining structures and 1.5-5.5 m right-lateral offsets have been measured at 45 sites of the on-land approximately 45-km-long fault section. Similar structures are delineated by fresh fault scarps and prominent pull-apart basins in the Sea of Marmara and Saros Bay. A second shock with M (sub w) =6.8 occurred on 13 September 1912, implying a 20-40-km-long rupture; the damage distribution and analysis of seismic records suggest an epicenter located farther west near Saros Bay, near the western termination of the 9 August rupture. Modeling of seismic records reveals a relative source time function between the two events and indicates 40 s rupture duration, in agreement with a 120+ or -30 km-long fault rupture for the 9 August shock. An estimated 150+ or -30 km-long rupture for the two earthquakes, combined with onshore and offshore fault segmentation, allow us to better constrain the western limit of the Marmara Sea seismic gap and the related potential for a large earthquake (sharply increased by the devastating 1999 Izmit [Sea of Marmara] seismic event).


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 38
Serial Issue: 11
Title: Rupture characteristics of the A.D. 1912 Murefte (Ganos) earthquake segment of the North Anatolian Fault (western Turkey)
Affiliation: Institut de Physique du Globe de Strasbourg, Strasbourg, France
Pages: 991-994
Published: 201011
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 26
Accession Number: 2010-100892
Categories: SeismologyEnvironmental geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2010276
Illustration Description: illus. incl. sketch maps
N40°15'00" - N41°04'60", E26°40'00" - E30°00'00"
Secondary Affiliation: Universite de Nice-Sophia Antipolis, FRA, FranceIstanbul Technical University, TUR, Turkey
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201052
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