About ISNet (International Seismic Network of NIED)

The National Research Institute for Earth Science and Disaster Resilience (NIED) has been actively involved in the development of Seismic Networks, Volcano Monitoring and Earthquake Disaster Mitigation projects in the Asia-Pacific region during the last two decades. From 2001 to 2010 NIED was in charge of the installation and operation of the first online broadband national seismic network of Indonesia (JISNET), in cooperation with the Meteorological, Climatological and Geophysical Agency of the Republic of Indonesia (BMKG). Also from 2009 to 2013 NIED lead a collaborative research project with the Philippine Institute of Volcanology and Seismology (PHIVOLCS), for the deployment of the first broadband seismic network of the Philippines. During these projects a system for the manual and automatic calculations of earthquake source mechanism parameters (SWIFT) was developed and is currently in operation at NIED, as well as in PHIVOLCS and BMKG. From 2012 NIED initiated the development of a system for the near-real time calculation of regional tsunamis (SWIFT-TSUNAMI) based on the SWIFT system, and started its operation in 2013 (Inazu et al. 2016). From 2015 NIED takes part in a 5 years disaster mitigation project with the Geological Survey of Colombia, which includes the incorporation of the SWIFT-TSUNAMI system in Colombia.

At present, we perform the automatic and manual estimation of source mechanism parameters and tsunami simulations for large seismic events in South-East Asia (Indonesia and Philippines) and Latin America, using the SWIFT-TSUNAMI system implemented at NIED. Manual CMT solutions for smaller events are also routinely obtained for Indonesia and Philippines. All results of earthquake mechanism parameters and tsunami simulations obtained by the SWIFT-TSUNAMI system are made available through our web page (www.isn.bosai.go.jp). Currently NIED is no longer in charge of operation or installation of broadband seismic stations in the Asian Pacific region, but is fully committed to further developments and continuous operation of the SWIFT and SWIFT-TSUNAMI systems.

Objectives of ISNet

1. To provide a rapid and reliable earthquake and tsunami information in particular for large seismic events in the Asia-Pacific region using the SWIFT and SWIFT-TSUNAMI systems, and promote their use in the region.
2. To produce a uniform database of earthquake source parameters and tsunami simulations for research.
3. To contribute to the understanding of source process of large earthquakes and their tsunami generation processes.

References

Inazu D., Pulido, N. and E. Fukuyama, J. Senda and H. Kumagai, Near-field tsunami forecast system based on near real-time seismic moment tensor estimation in the regions of Indonesia, the Philippines, and Chile, Earth Planets and Space, 68, 1-18, 2016.

Nakano, M., H. Kumagai, and H. Inoue, Waveform inversion in the frequency domain for the simultaneous determination of earthquake source mechanism and moment function, Geophys. J. Int., 173, 1000-1011, 2008.