Recent Report on "Slow Earthquake Database"

More and more people are interested in slow earthquakes recently since slow earthquakes possibly take a part of physical processes of huge earthquakes' occurrences (Obara and Kato, Science, 2016). Many researchers in the world have detected them based on seismic or geodetic observation networks and reported their own catalogs on papers or their websites. In order to utilize them, researchers need to collect them from different sources and deal with many different formats. Hence, we developed "Slow Earthquake Database" (http://www-solid.eps.s.u-tokyo.ac.jp/ sloweq/) in December 2017 (Kano et al., SRL, 2018), as a part of the project "Science of Slow Earthquake" supported by JSPS.

Our database website consists of five sections: "Map+DL", "Direct_DL", "Policy", "AD" and "NEWS". In "Map+DL" section, users can visualize source locations of slow earthquakes on Google Maps, access to the information of the original papers, and download them with our unified format. As of July 2018, 44 catalogs are registered in our database and categorized by the region (Japan, Cascadia, San Andreas, Mexico, Chile, New Zealand, and Taiwan) and phenomenon (low-frequency tremors, low-frequency earthquakes, very low-frequency earthquakes, slow slip events, and repeating earthquakes). "Direct_DL" section has been developed so that users can download the original data of slow earthquake catalogs, which can include more information than in our unified format. "Policy", "AD", and "NEWS" sections respectively provide the general policy of our database and individual policy to use each catalog, announcements about collecting slow earthquake catalogs, and news including update history.

Some problems still remain in our database and website, e.g., too many data cannot be downloaded at once and the format of our database does not support spatiotemporal slip distributions but we have improved and will continue to improve our database. We collect more catalogs, enhance usability, ensure that our database is widely recognized, and make it sustainable. In this presentation, we report the recent updates and our future vision of our database.

Acknowledgment: We thank all contributors of our database. This work is supported by JSPS KAKENHI Grant Numbers JP16H06472, JP16H06473, JP16H06474, JP16H06476, JP16H06477, and JP16K21728.