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������������������������������������������������ 2024�N1��1�� �\�o�����n�k (M7.6)�ً̋}�n�k���� ������������������������������������������������ 1.�n�k�ɂ��� (Earthquake Information) ���̒n�k�́A�ΐ쌧�𒆐S�ɑ���Ȕ�Q�������炵�܂����B��Ђ��ꂽ���X�ɐS��肨�������\���グ�܂��B�܂��ꍏ������������S��肨�F��\���グ�܂��B ��ʌ����ً̋}�n�k����́A�ŏ���P�g���ϑ�����Ă���6�b��A�n�k����7�b��ɔ\�o�n���ɔ��M����܂����B �C�ے��̔��M�ɂ��A�k���ߖT��20-30km�͈̔͂ł́AS�g�̓����ɑ��Ԃɍ����܂���ł����B�������Ȃ���A�h�ꂪ�������������Ƃ��l������ƁA�h��n�߂̒i�K�ő����\���ꂽ���Ƃ͋����h��ɑ��Đg�\�����Ō��ʂ��������ƍl�����܂��B �����16:18��M6.1�̗]�k�ł��ً}�n�k����\���Ă���A�����ނ˓K�ɓ��삵���ƍl�����܂��B This earthquake has caused severe damage, especially in Ishikawa Prefecture. We would like to express our deepest sympathies to those who have been affected by the earthquake. We also pray for the earliest possible recovery. The earthquake early warning for the general public was sent out to the Noto region 6 seconds after the first P-wave was observed and seven seconds after the earthquake occurred. According to the JMA's warning history, the earthquake early warning did not arrive in time for the arrival of the S-wave in the 20-30 km range near the epicenter. However, considering that the shakings lasted for several minutes, the fact that the warning was issued at the beginning of the S-wave was effective in preparing for strong shakings. The earthquake early warning was also issued for the M6.1 aftershock at 16:18, and the system was considered to have generally worked properly. ------------------------------------------------------------------- 2024/01/01,16:10:22.57 37.496 137.270 15.9 7.6 ------------------------------------------------------------------- Table1. Earthquake information. Origin time, Epicentral latitude, longitude, depth, and JMA magnitude from the left.(ref. JMA catalog) Fig.1. Event location. 2.�ϑ��_���z (Station Distribution) Fig.2. Station Distribution. 3.�ً}�n�k���M�� (JMA Earthquake Early Warning Report) -------------------------------------------------------------------------------------------- [01] 24/01/01-16:10:08 5+ M5.5 37.5N 137.2E 010km (24/01/01-16:10:16) [20] 24/01/01-16:10:08 07 M6.6 37.5N 137.2E 010km (24/01/01-16:10:43) [30] 24/01/01-16:10:08 07 M7.4 37.6N 137.2E 010km (24/01/01-16:11:07) --------------------------------------------------------------------------------------------- �i�����珇�ɏ��ԍ��C�k�����C�ő�\���k�x�C�}�O�j�`���[�h�C �k���ܓx�C�k���o�x�C�k���[���C�d�����\�����j from CEORKA --------------------------------------------------------------------------------------------- Table2. Earthquake early warning reports. Information ID, Origin time, Maximum Intensity, JMA magnitude, Epicentral latitude, longitude, depth, and time to issue the report from the left.(ref. The Committee of Earthquake Observation and Research in the Kansai Area) �C�ے��ɂ��ً}�n�k����̓��e (JMA EEW performance of this earthquake)�F �\��E �x�� �ً}�n�k����i�\��j���\�̃��X�g�@List of JMA EEW forecasts �ً}�n�k����i�x��j���\�̃��X�g�@List of JMA EEW warnings 4.�ϑ��L�^ (Observed Records) Fig.2. Peak Ground Acceleration (left) and Peak Ground Velocity (right). Fig.3. JMA shaking intensity. Fig.4. Seismic activity of past 40 years. 5.��͌��� (Results of the IPFx method) Fig.5. Time history of the estimates for source parameters by the IPFx method. The horizontal axis shows the time of processing. - upper left: error of epicenter against the final estimation - upper right: JMA magnitude (black) and maximum estimated shaking intensity (red) - lower left: epicenter depth - lower right: automatic picking time (black) and theoretical arrival time (red) Fig.6. Simulation of the IPFx method. The triangles show seismic stations, and colored triangles are triggered stations. The star shows the estimated location of an earthquake. The color of the samples is proportional to the likelihood of the hypocenter location. Fig.7. The waveforms aligned from the epicenter estimated by the IPFx method. Fig.8. The velocity waveforms at ISK002 station. References: Yamada, M., K. Tamaribuchi, and S. Wu (2021). IPFx: Extended integrated particle filter method for achieving high-performance earthquake early warning system. Bulletin of the Seismological Society of America, 111(3), pp.1263-1272, https://doi.org/10.1785/0120210008, 2021.05. journal Yamada, M. and J. Mori (2021). P-wave picking for earthquake early warning: Refinement of a Tpd method, Geophysical Journal International, ggab349, https://doi.org/10.1093/gji/ggab349, 2021.08. journal Acknowledgements: �C�ے��̐k�x���A�h�ЉȊw�Z�p��������K-NET,KiK-net,Hi-net,S-net�̔g�`�A�C�ے��̋��k�g�`�A�ꌳ���k���J�^���O�𗘗p���܂����B �ً}�n�k����\�����n�k�̉�͌��� �R�c�^���@�z�[��
