[S-SS09] Strong Ground Motion and Earthquake Disaster

[SSS09-10] Improvement of resolution and precision for "seismic intensity distribution in map form"

*Kazumasa Kayano¹, Takeshi Sato¹, Akio Kawai¹, Masao Abe¹, Sadaaki Nishida¹, Takahiro Oka¹, Noriko Kamaya¹ (1.Japan Meteorological Agency)

Keywords:indication of seismic intensity distribution in map form, improvement of resolution, improvement of precision, seismic intensity, earthquake

In the event of an earthquake with a seismic intensity of 5 Lower or greater, the Japan Meteorological Agency (JMA) estimates the seismic intensity distribution over the area, including areas where there are no seismic intensity observation stations, and provides it as an seismic intensity distribution in map form, from February 1, 2023, JMA is starting to provide of seismic intensity distribution in map form with higher resolution and higher precision than before. In particular, in addition to changing the ground amplification used from 1km grid square system to 250m grid square system and increasing the resolution, by using seismic intensity prediction technology of earthquake early warning, even if there is an observation point where seismic intensity data is not available due to power failure etc, it made it possible to create and provide seismic intensity distribution in map form with high precision. Such an seismic intensity distribution in map form, which is provided approximately 15 minutes after an earthquake occurs, can be used to select appropriate rescue routes and evacuation sites immediately after an earthquake occurs, and to identify areas where emergency response should be prioritized. In addition to providing the seismic intensity distribution in map form on the JMA website, etc., we also provide plotting data (conforming to the standard regional grid square system of the Ministry of Internal Affairs and Communications) that can be easily superimposed on map information, so please make use of it. We are planning to introduce these.