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A new observation of dynamically triggered regional seismicity: Earthquakes in Greece following the August 1999 Izmit, Turkey earthquake

Brodsky, Emily E. and Karakostas, Vassilis and Kanamori, Hiroo (2000) A new observation of dynamically triggered regional seismicity: Earthquakes in Greece following the August 1999 Izmit, Turkey earthquake. Geophysical Research Letters, 27 (17). pp. 2741-2744. ISSN 0094-8276.

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The M_w = 7.4 Izmit, Turkey earthquake triggered widespread regional seismicity in Greece over a study region extending from 400 km to nearly 1000 km away from the epicenter. Small events began immediately after the passage of the mainshock surface waves suggesting that the transient stresses of the seismic waves were the trigger. The increase in cataloged earthquakes in ordinary continental crust is a new observation and is statistically significant at the 95% level. Unlike the previous example of distant triggering during the Landers earthquake, the activated seismicity occurred entirely in non-volcanic areas. The Greek sites were triggered by waves with amplitudes at least a factor of 3 lower than the observed triggering threshold for Imperial Valley. We speculate that dynamic triggering on a regional-scale results in countrywide episodes of increased seismicity, or “superswarms”, in regions with low triggering thresholds such as Greece.

Item Type:Article
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URLURL TypeDescription DOIArticle
Brodsky, Emily E.0000-0002-6855-6860
Kanamori, Hiroo0000-0001-8219-9428
Additional Information:© 2000 American Geophysical Union. Paper number 2000GL011534. Received February 24, 2000; revised June 29, 2000; accepted July 5, 2000. We thank G. Hirth for insights into stress corrosion and two anonymous reviewers for their comments. This work was partially supported by projects 13664-1998-02 FiPCA ISPGR, 7454 of the District of Central Macedonia, Greece and the Southern California Earthquake Center. SCEC is funded by NSF Cooperative Agreement EAR-8920136 and USGS Cooperative Agreements 14-08-0001-A0899 and 1434-HQ-97AG01718. The SCEC contribution number for this paper is 520. This is contribution 8694 of the Caltech Division of Geological and Planetary Sciences.
Funding AgencyGrant Number
FiPCA ISPGR13664-1998-02
Southern California Earthquake Center (SCEC)UNSPECIFIED
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Caltech Division of Geological and Planetary Sciences8694
Issue or Number:17
Record Number:CaltechAUTHORS:20141027-103137987
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50842
Deposited By: Tony Diaz
Deposited On:27 Oct 2014 17:41
Last Modified:03 Oct 2019 07:27

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