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2015年2月17日 岩手県沖の地震
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1.地震について (Earthquake Information)


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   2015/02/17,13:46:39.36 40.085 142.112 49.5 5.7
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Table1. Earthquake information. Origin time, Epicentral latitude, longitude, depth, and JMA magnitude from the left.(ref. Hi-net and JMA source mechanisms)


Fig.1. Event location.



2.観測点分布 (Station Distribution)


Fig.2. Station Distribution.



3.緊急地震速報発信状況 (Earthquake Early Warning Report)

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   [01] 15/02/17-13:46:42 04 M5.5 40.1N 142.2E 010km (15/02/17-13:46:51)
   [03] 15/02/17-13:46:39 04 M5.7 40.1N 142.2E 050km (15/02/17-13:46:53)
   [04] 15/02/17-13:46:39 04 M5.6 40.1N 142.2E 050km (15/02/17-13:46:59)
   [05] 15/02/17-13:46:39 04 M5.8 40.1N 142.2E 050km (15/02/17-13:47:08)
   [06] 15/02/17-13:46:39 04 M5.8 40.1N 142.2E 050km (15/02/17-13:47:18)
   [07] 15/02/17-13:46:39 04 M5.7 40.1N 142.1E 050km (15/02/17-13:47:38)
   [08] 15/02/17-13:46:39 04 M5.8 40.1N 142.2E 050km (15/02/17-13:47:42)
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(左から順に情報番号,震源時,最大予測震度,マグニチュード, 震央緯度,震央経度,震源深さ,電文発表時刻) from CEORKA
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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)

--> 気象庁による緊急地震速報の内容

4.観測記録 (Observed Records)


Fig.3. Peak Ground Acceleration (left) and Peak Ground Velocity (right).


Fig.4. JMA seismic intensity.


Fig.5. Population exposure. A circle size shows the population at the town, and a circle color shows the seismic intensity at the town.


Fig.6. Seismic activity of past 40 years.

5.解析結果 (Analytical Result)


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   IWT0031502171346 141.886 40.008 0.498 8.310 21.075 5.7 4.8
   IWT0021502171346 141.764 40.182 0.994 8.930 31.543 5.7 5.5
   IWTH091502171346 141.712 40.086 0.507 9.180 34.115 5.7 4.9
   IWTH081502171346 141.783 40.269 0.509 8.930 34.647 5.7 4.9
   IWT0041502171346 141.967 39.736 0.688 9.750 40.715 5.7 5.1
   IWTH141502171346 141.909 39.743 0.999 9.850 41.712 5.7 5.5
   IWT0011502171346 141.719 40.410 0.694 10.430 49.184 5.7 5.1
   IWT0191502171346 141.658 39.803 0.809 10.770 49.832 5.7 5.3
   IWTH031502171346 141.652 39.802 0.637 10.830 50.329 5.7 5.1
   IWTH071502171346 141.571 40.271 0.950 10.630 50.480 5.7 5.4
   Observed/Estimated Mw(median) tauc 5.7 5.1 0.7
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Table3. Analytical results using Tau_c method (Wu and Kanamori, 2005). Station ID, Station longitude, latitude, tauc, P-arrival time, epicentral distance(km) , magnitude, and estimated magnitude from the left.


Fig.7. Time history of the estimates for source parameters by the IPF method (Wu et al., 2014). The error of epicenter, depth, error of origin time, JMA magnitude are shown. X-axis shows the time after the closest o'clocck sharp.

Reference
Wu, Y. M. and H. Kanamori (2005). Experiment on an onsite early warning method for the Taiwan early warning system, Bull. Seism. Soc. Am., 95, 347-353.
Wu, S, Yamada, M., K. Tamaribuchi, and J. Beck (2014). Multi-events Earthquake Early Warning algorithm using a Bayesian approach. Geophysical Journal International.
気象庁の震度情報、防災科学技術研究所のK-NET,KiK-netの波形、気象庁の強震波形、関西地震観測研究協議会の強震波形、一元化震源カタログをを利用しました。

緊急地震速報を発表した地震の解析結果
山田真澄 ホーム