Seismological and engineering characteristics of strong motion data from 24 and 26 September 2019 Marmara Sea earthquakes

Fatma Sevil Malcioglu; Hakan Süleyman; Eser ?akt?

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Seismological and engineering characteristics of strong motion data from 24 and 26 September 2019 Marmara Sea earthquakes

机译：Seismological and engineering characteristics of strong motion data from 24 and 26 September 2019 Marmara Sea earthquakes

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An M_W 4.5 earthquake took place on September 24, 2019 in the Marmara Sea. Two days after, on September 26, 2019, Marmara region was rattled by an M_W5.7 earthquake. With the intention of compiling an ample strong ground motion data set of recordings, we have utilized the stations of Istanbul Earthquake Rapid Response and Early Warning System operated by the Department of Earthquake Engineering of Bo?azi?i University and of the National Strong Motion Network operated by AFAD. Altogether 438 individual records are used to calculate the source parameters of events; namely, corner frequency, radius, rupture area, average source dislocation, source duration and stress drop. Some of these parameters are compared with empirical relationships and discussed extensively. Duration characteristics are analysed in two steps; first, by making use of the time difference between P-wave and S-wave onsets and then, by considering S-wave durations and significant durations. It is observed that they yield similar trends with global models. PGA, PGV and SA values are compared with three commonly used ground motion prediction models. At distances closer than about 60 km, observed intensity measures mostly conform with the GMPE predictions. Beyond 60 km, their attenuation is clearly faster than those of GMPEs. A frequency- dependent Q model is developed by using both events. Its consistency with existing regional models is confirmed.

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《Bulletin of earthquake engineering》 |2022年第11期|5567-5599|共33页
作者
Fatma Sevil Malcioglu; Hakan Süleyman; Eser ?akt?;
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Department of Earthquake Engineering, Kandilli Observatory and Earthquake Research Institute, Bo?azi?i University, 34684 ?engelk?y, Istanbul, Turkey;

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正文语种英语
中图分类地震学;
关键词
Earthquake ground motions; Seismic attenuation; Ground motion prediction equations; Ground motion duration; North Anatolian fault; Marmara;

Seismological and engineering characteristics of strong motion data from 24 and 26 September 2019 Marmara Sea earthquakes

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