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Project S5 High resolution multi-disciplinary monitoring of active fault test-sites areas in Italy

WP 4.3 Estimates of earthquakes source parameters and structure characteristics from massive seismic waveform analysis. Project S5 High resolution multi-disciplinary monitoring of active fault test-sites areas in Italy.

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Project S5 High resolution multi-disciplinary monitoring of active fault test-sites areas in Italy

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  1. WP 4.3 Estimates of earthquakes source parameters and structure characteristics from massive seismic waveform analysis Project S5High resolution multi-disciplinary monitoring of active fault test-sites areas in Italy Task 4L’Aquila seismic sequence: a test site to understand the physical processes in the earthquake generation

  2. STRUCURE CHARACTERISTICS Automatic P and S wave arrival time picking and P-polarity measurements ( WP 1.1) Events location in 1D velocity models Seismic anisotropy ( WP 2.3 ) Vp/Vs estimation from traveltime data. Seismic tomography (Vp, Vp/Vs) of the fault system. SOURCE PARAMETERS Moment tensor solutions ( WP 2.5: Cut and Paste Method) Source parameters estimations ( WP 3.2) Preliminary attenuation and site response determination WP 4.3 : Estimates of earthquakes source parameters and structure characteristics from massive seismic waveform analysis

  3. DATA ANALYSIS Automatic P and S wave arrival time picking and P-polarity measurements ( WP 1.1) 2866 aftershocks with Ml>1.9 P obs= 72,829 Weights 0 =30,351 (41.68 %) Weights 1= 27,649 (37.97 %) Weights 2= 9,398 (12.90 %) Weights 3= 5,431 ( 7.45 %) S obs=36,229 Weights 2= 21,060 (58.13 %) Weights 3= 15.169 (41.87 %)

  4. 1D P-wave Velocity Model

  5. Vp/Vs analysis from traveltime data. Investigation of the possible role of the fluid migrations in the fault system. Method: linear regression of S-P vs P traveltimes (Wadati diagram). Application to: Foreshocks (manual picks: events from 2009 January 16 to 2009 April 06 (h 00:36) Aftershocks (on MPX dataset: in progress)

  6. Vp/Vs (foreshocks)

  7. Vp/Vs (foreshocks) and anisotropy at AQU

  8. Vp/Vs (foreshocks) Observations not explained by the previous scheme: complexity of the fluid diffusion processes.

  9. Vp/Vs analysis from traveltime data (aftershocks) Vertical bars = occurrence of M>3.8

  10. Research Unit S5 –RU4 (University of Messina) Moment tensor solutions of the 2009 L’Aquila seismic sequence CAP Each waveform is broken into Pnl and surface wave segments schematic flow chart for data processing Mw + depth

  11. Selected dataset From 2009/04/01 to 2009/07/31 Ml>=2.7 Total earthquakes = 554

  12. SOURCE PARAMETERS ESTIMATIONS ( WP 3.2) Events: Ml>=2.5 (from 2009 March 30 to 2009 April 30) Data: Waveforms from accelerometers (RAN DPC +INGV rete mobile)

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