Yan Y. Kagan Dept. Earth and Space Sciences, UCLA, Los Angeles, CA 90095-1567, Earthquake.

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Presentation transcript:

Yan Y. Kagan Dept. Earth and Space Sciences, UCLA, Los Angeles, CA , Earthquake forecast with CMT vs PDE catalogs CSEP Global Collaboration & Testing Meeting Monday, April 21,

CMT catalog: Shallow earthquakes,

PARAMETER VALUES FOR VARIOUS SUBDIVISIONS OF CMT CATALOG, /03/31, Mw>= All Subd. Orog. Inter. Fast Slow N Mmax Inf/N Ind/N \mu b \delta \theta * * \sigma * \eps_r \eps_h * * 3.0* \sigma – focal size for M4 EQ; \eps_r – horizontal error; \eps_h – vertical error

NW Pacific -- Here we demonstrate forecast effectiveness: displayed earthquakes (108 events) occurred after smoothed seismicity forecast had been calculated.

SW Pacific -- Here we demonstrate forecast effectiveness: displayed earthquakes (170 events) occurred after smoothed seismicity forecast had been calculated.

1080 events (10 times the actual number of events in ) have been simulated, using the forecast density. Some points overlap; in low activity area we specified some low-level density to avoid surprises.

World seismicity: 1990 – 2000 (PDE)

PARAMETER VALUES FOR VARIOUS SUBDIVISIONS OF PDE CATALOG, /01/01, M>= All Subd. Orog. Inter. Fast Slow N Mmax Inf/N Ind/N \mu b \delta \theta \sigma * \eps_r \eps_h 3.0* * 3.0* 3.0* \sigma – focal size for M4 EQ; \eps_r – horizontal error; \eps_h – vertical error

PARAMETER VALUES FOR VARIOUS SUBDIVISIONS OF PDE CATALOG, /01/01, M>=5.0; CLOSE AFTERSHOCKS REMOVED (6.5%) All Subd. Orog. Inter. Fast Slow N Mmax Inf/N Ind/N \mu b \delta * 0.0* 8. \theta * \sigma * 0.15* 0.15* 10. \eps_r \eps_h 3.0* * 3.0* 3.0* \sigma – focal size for M4 EQ; \eps_r – horizontal error; \eps_h – vertical error s

NW Pacific -- Here we demonstrate forecast effectiveness: displayed earthquakes M>=5.0 occurred after smoothed seismicity forecast had been calculated.

Forecast with CMT vs PDE catalogs The CMT catalog has moment-tensor solutions, hence focal mechanisms can be forecasted. However, the present method can be extended only for subduction zones. The PDE catalog has lower magnitude threshold (4.8 vs 5.8 for CMT). The present methodology can be used for global forecast. A program can be easily designed to issue within a few minutes long- and short-term forecasts with the PDE catalog at the arbitrary spatial window.

END Thank you