A new observation of Dynamically Triggered Regional Seismicity: Earthquakes in Greece following the August, 1999 Izmit, Turkey earthquake

Details A new observation of Dynamically Triggered Regional Seismicity: Earthquakes in Greece following the August, 1999 Izmit, Turkey earthquake A new observation of Dynamically Triggered Regional Seismicity: Earthquakes in Greece following the August, 1999 Izmit, Turkey earthquake

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.2741b&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 17, p. 2741-2744

Physics

43

Seismology: Earthquake Dynamics And Mechanics, Seismology: Seismic Hazard Assessment And Prediction, Seismology: Seismicity And Seismotectonics

Scientific paper

The Mw=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 manishock 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.

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