Earthquake catalog for Japan Region, with and without aftershocks

The Japan region is characterized by intense seismic activity. This catalog consists of earthquakes in a polygon bounded by 129°27'-144°73' E and 26°96'-43°04' N and from March 6, 2003, to July 10, 2023, obtained from the Japanese Meteorological Agency [1,2]. Aftershocks were identified using Molchan–Dmitrieva’s algorithm [3], which relies on the statistical analysis of the spatiotemporal distribution of seismic events. The aftershocks were subsequently marked using the program described in [4], which is an adaptation of the earlier program developed by Smirnov [5].

1. Kazushige Obara, Keiji Kasahara, Sadaki Hori, and Yoshimitsu Okada. A densely distributed high-sensitivity seismograph network in japan: Hi-net by national research institute for earth science and disasterprevention. Review of scientific instruments, 76(2), 2005.

2. Yoshimitsu Okada, Keiji Kasahara, Sadaki Hori, Kazushige Obara, Shoji Sekiguchi, Hiroyuki Fujiwara, and Akira Yamamoto. Recent progress of seismic observation networks in japan—hi-net, f-net, k-net and kik-net—. Earth, Planets and Space, 56:xv–xxviii, 2004.

3. GM Molchan. Identification of aftershocks: review and new approaches.Computative seismology, 24:19–50, 1991.

4. VG Gitis, AB Derendyaev, and KN Petrov. Analysis of the impact ofremoval of aftershocks from catalogs on the effectiveness of systematicearthquake prediction. Journal of Communications Technology andElectronics, 65:756–762, 2020.

5. VB Smirnov. Prognostic anomalies of seismic regime: methodical basisof data preprocessing. Geofisicheskiye Issledovaniya, 10(2):7–22, 2009.