16:15 〜 16:30
[SCG53-04] 2023年トルコ・シリア地震の強震記録への緊急地震速報の手法の適用
キーワード：緊急地震速報、2023年トルコ・シリア地震
On 6 February 2023 at 01:17(UTC), a large earthquake (Mw 7.8) struck southern and central Turkey, as well as northern and western Syria. A large aftershock, with Mw7.5, followed the mainshock 9 hours later. The strong motions of these earthquakes were recorded by the Disaster and Emergency Management Authority (AFAD) in Turkey. We obtained the strong motion waveforms from the website of the Turkish Earthquake Data Center System and applied the earthquake early warning method to locate the hypocenter and estimate the rupture dimension.
We applied the Extended IPF (IPFx) method to locate the hypocentre and estimate the magnitude. The IPFx method was designed to locate earthquakes automatically under active seismicity (Yamada et al., 2021). The first estimate for the Mw7.8 quake was provided 5 seconds after the origin time, and 1 second after the first P-wave detection. The location error against the catalog location was less than 5 km. The detection was properly performed if the data was transmitted in real-time. The Mw7.5 quake was detected 11 seconds after the origin time, and 5 seconds after the first P-wave detection. The location error was about 10 km. The IPFx method can detect these earthquakes properly without changing any detection parameters.
We also applied a method to detect fault rupture extent as the rupture propagates (XYtracker, Xiao and Yamada, 2022). The method uses the high-frequency component to estimate the source parameters (such as width, length, and strike of the fault). We estimate the intensity magnitude from the stations near the epicenter, and then estimate fault distance from near-source stations. Our results show a good estimate for the strike (N45E), but the seismic intensities estimated from the ground motion prediction equation show a large error compared to the observed intensity.
We applied the Extended IPF (IPFx) method to locate the hypocentre and estimate the magnitude. The IPFx method was designed to locate earthquakes automatically under active seismicity (Yamada et al., 2021). The first estimate for the Mw7.8 quake was provided 5 seconds after the origin time, and 1 second after the first P-wave detection. The location error against the catalog location was less than 5 km. The detection was properly performed if the data was transmitted in real-time. The Mw7.5 quake was detected 11 seconds after the origin time, and 5 seconds after the first P-wave detection. The location error was about 10 km. The IPFx method can detect these earthquakes properly without changing any detection parameters.
We also applied a method to detect fault rupture extent as the rupture propagates (XYtracker, Xiao and Yamada, 2022). The method uses the high-frequency component to estimate the source parameters (such as width, length, and strike of the fault). We estimate the intensity magnitude from the stations near the epicenter, and then estimate fault distance from near-source stations. Our results show a good estimate for the strike (N45E), but the seismic intensities estimated from the ground motion prediction equation show a large error compared to the observed intensity.