Earth and Planetary Science
EPS Near-Surface Geochemistry and Geobiology

Development of a Slow Earthquake Database

Tuesday, August 7, 2018

Masayuki Kano, Naofumi Aso, Takanori Matsuzawa, Satoshi Ide, Satoshi Annoura, Ryuta Arai, Satoru Baba, Michael Bostock, Kevin Chao, Kosuke Heki, Satoshi Itaba, Yoshihiro Ito

Noriko Kamaya, Takuto Maeda, Julie Maury, Mamoru Nakamura, Takuya Nishimura, Koichiro Obana, Kazuaki Ohta, Natalia Poiata, Baptiste Rousset, Hiroko Sugioka, Ryota Takagi,Tsutomu Takahashi, Akiko Takeo, Yoko Tu, Naoki Uchida, Yusuke Yamashita, Kazushige Obara


Seismological Research Letters (2018) 89 (4): 1566-1575.

We constructed the Slow Earthquake Database by compiling a wide variety of seismically and geodetically detected catalogs on slow earthquakes from the peer‐reviewed papers and institutional reports and converted their original formats to a unified format. Based on the agreement of the corresponding authors of the original catalogs, we converted and stored the catalogs in a single repository. Users can download the multiple catalogs in either the unified format or their preferred format. This database is available for all users as long as they follow the general policy and the individual policy of each catalog. In addition, users can visualize the source distribution in Google Maps before downloading the data, which assures users that events have occurred during the selected time span.

The constructed database enables users to find where, when, and what type of slow earthquakes have occurred. Comparisons of catalogs, especially comparisons between seismically and geodetically detected slow earthquakes, will promote a more comprehensive understanding of slow earthquake activity, such as the spatial relationship among different types of slow earthquakes and regional differences among slow earthquake activity. Such comparisons can also help researchers characterize the differences among source locations found by various detection methods. Another advantage of the database is that users can download multiple catalogs as a single compiled catalog in the unified or preferred format. The unified catalog contains references to the original catalogs so that users can refer to them for more detailed information. As a result of such standardization, researchers will find it more convenient to access the findings of previous studies, which will promote research on slow earthquakes that may foster future collaboration among researchers from various fields and further our understanding of the mechanisms, environmental conditions, and underlying physics of slow earthquakes. Furthermore, we expect that the database will play a leading role in establishing a global standard of slow earthquake catalogs. In cooperation with many researchers, we are now compiling more catalogs, which will result in a more and more comprehensive database.