FAST TRACK PAPER: The Source-Scanning Algorithm: mapping the distribution of seismic sources in time and space

Details FAST TRACK PAPER: The Source-Scanning Algorithm: mapping the distribution of seismic sources in time and space FAST TRACK PAPER: The Source-Scanning Algorithm: mapping the distribution of seismic sources in time and space

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004geoji.157..589k&link_type=abstract

Geophysical Journal International, Volume 157, Issue 2, pp. 589-594.

Astronomy and Astrophysics

Astronomy

45

Ets Tremors, Seismic Source Distribution, Source-Scanning Algorithm

Scientific paper

We introduce a new method, which we call the Source-Scanning Algorithm (SSA), for imaging the distribution of seismic sources in both time and space. Using trial locations and origin times, the method calculates the `brightness' function by summing the absolute amplitudes observed at all stations at their respective predicted arrival times. The spatial and temporal distribution of sources is then identified by a systematic search throughout the model space and time for the maximum brightness. The greatest advantages of this method are that: (1) it exploits waveform information (both arrival times and relative amplitudes) without the need to calculate high-frequency synthetic seismograms; and (2) it requires neither pre-assembled phase-picking data nor any a priori assumptions about the source geometry. A series of tests using synthetic data have shown that this method is robust and can faithfully recover the input source configuration to within 1 grid interval. Finally, we demonstrate the value of the algorithm by locating a typical tremor event with emergent waveforms that occurred during the recent episodic tremor and slip (ETS) sequence in the northern Cascadia subduction zone.

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