To
contribute to the understanding of source process of earthquakes and long term
seismic activity, the National Research Institute for Earth Science and
Disaster Prevention NIED maintains the international seismic Network (ISN) in
the Asian-Pacific region. Using broadband seismic data from Indonesia,
Philippines and Chile we perform automatic as well as manual estimation of
moment tensors of seismic events in these regions by using the SWIFT system developed at
NIED (Nakano et al. 2008), and maintain a searchable database of source
parameters of earthquakes by SWIFT.
Today we make accessible through the internet a system for the real time calculation
of local tsunamis in Indonesia, Philippines and Northern Chile using a tsunami
simulation code and visualization system developed at NIED, as well as
earthquake source parameters estimated by SWIFT (Inazu et al. 2014, Pulido et al. 2015).
The system uses the automated calculation of
moment tensors by SWIFT to carry out the automatic simulation and visualization
of tsunami. Maps of maximum tsunami heights within the target regions and along
the coasts as well as the fault model parameters used for tsunami simulations
are generated and displayed automatically. Tsunami calculations are performed
for all events with available automatic SWIFT/CMT solutions. Tsunami
calculations are re-computed using SWIFT manual solutions for events with
Mw>5.5 and centroid depths shallower than 100 km. Revised maximum tsunami
heights as well as animation of tsunami propagation are also calculated and
displayed for the two double couple solutions by SWIFT.
Source parameters estimated by SWIFT (Mw>4.5) as well as automatic tsunami
simulations are available at the following URL:
https://www.isn.bosai.go.jp/index.html
For details check the press release:
https://www.bosai.go.jp/e/
References
Pulido, N., D. Inazu, T. Saito, J. Senda, E. Fukuyama and H. Kumagai, Real time earthquake information and tsunami
estimation system for Indonesia, Philippines and Chile regions, Japan
Geoscience Union meeting, 2015.
Inazu D., T. Saito, H. Kumagai, N. Pulido, and E. Fukuyama, Real-time tsunami
simulation and visualization system using rapid CMT solutions for the seas around
Philippines and Indonesia, Japan Geosciences Union Meeting, HDS27-11, 2014.
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.