Source inversion of W phase: speeding up seismic tsunami warning

Details Source inversion of W phase: speeding up seismic tsunami warning Source inversion of W phase: speeding up seismic tsunami warning

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008geoji.175..222k&link_type=abstract

Geophysical Journal International, Volume 175, Issue 16, pp. 222-238.

Astronomy and Astrophysics

Astronomy

16

Tsunamis, Earthquake Source Observations, Surface Waves And Free Oscillations, Wave Propagation, Early Warning

Scientific paper

W phase is a long period phase arriving before S wave. It can be interpreted as superposition of the fundamental, first, second and third overtones of spheroidal modes or Rayleigh waves and has a group velocity from 4.5 to 9 km s-1 over a period range of 100-1000 s. The amplitude of long period waves better represents the tsunami potential of an earthquake. Because of the fast group velocity of W phase, most of W phase energy is contained within a short time window after the arrival of the P wave. At a distance of 50°, W phase energy is contained within 23 min after the origin time which is the distinct advantage of using W phase for rapid tsunami warning purposes. We use a time domain deconvolution method to extract W phases from the broad-band records of global seismic networks. The bandwidth of W phase is approximately from 0.001 to 0.01 Hz, and we bandpass filter the data from 0.001 to 0.005 Hz in most cases. Having extracted W phase from the vertical component records, we perform a linear inversion using a point source to determine Mw and the source mechanism for several large earthquakes including the 2004 Sumatra-Andaman earthquake, the 2005 Nias earthquake, the 2006 Kuril Is. earthquake and the 2007 Sumatra earthquake. W phase inversion yields reliable solutions and holds promise of the use of W phase for rapid assessment of tsunami potential.

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