This database is a collection of measured or observed data mainly for the purpose of earthquake studies and published information on crustal stress in Japan. We are going to collect more data and information, not only on earthquake studies but on other studies.
Information about crustal stress includes data gathered from direct measurements, such as hydraulic fracturing and stress relief, and from boring cores. It also includes information about focal mechanism solutions of crustal earthquakes shallower than 20 km and the anisotropy of shear-wave splitting which is strongly related with stress orientations.
Latest Update
5 February 2021
The hypocenters of the JMA catalog in 2020 were added.
Data on GoogleMaps™
By checking the checkboxes of the right side menu, information will be displayed on the map. The lines on the map show SHmax, LSPD azimuths and P-axis orientation. Please click any line on the map and check detailed information from links in the balloons. The segments of active faults on the map are colored in red.
As reference information, the annual hypocenters, Seamless Digital Geological Map, azimuths of P-axis and focal mechanism solutions can be layered on GoogleMaps™.

AIST does not express any official opinion on the contents of Google Maps™, which are used as a base map for this database.
GSI Maps uses GSI Tiles delivered from Geospatial Information Authority of Japan (GSI). Japanese)
The bathymetric contours are derived from those contained within the GEBCO Digital Atlas, published by the BODC on behalf of IOC and IHO (2003) ( 海上保安庁許可第292502号(水路業務法第25条に基づく類似刊行物) Shoreline data is derived from: United States. National Imagery and Mapping Agency. "Vector Map Level 0 (VMAP0)." Bethesda, MD: Denver, CO: The Agency; USGS Information Services, 1997.

Text, data, images and other content on this database are provided manually. Our operators read numerical values from figures when original materials did not contain any specific numerical values. Texts, data, images and other content on this database are provided without a warranty of any kind, either expressed or implied, including but not limited to the implied warranties of merchantability, fitness for a particular use, and/or non-infringement. AIST assumes no responsibility, and shall not be liable for any damage to or viruses that may infect your computer equipment or other property on account of your use of the site or your downloading of any text, data, images or content from this database.


We are grateful to all copyright holders who have kindly agreed to the incorporation of their data into our database. Azimuths of P-axis and focal mechanism solutions are based on Japan Meteorological Agency Unified Earthquake Catalog.
This study was partly supported by the Grant-in-Aid for JSPS Fellows (No. 15.1522) financed by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan (T. Mizuno).