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TransientIdentificationandLocation

People:

Davide Piccinini – davide.piccinini@ingv.it;

Gilberto Saccorotti – gilberto.saccorotti@pi.ingv.it

In the last decades earthquake scientists have discovered evidence for a new type of seismic transients called non-volcanic tremor (NVT; a). NVT are characterized by weak and sustained seismic signals episodically associated to slow slip or aseismic creep along faults (b, c). From this point of view NVT may represent a key to understand fundamental processes at the deep roots of the faults (d). The detection and location of these kinds of events may help in the understanding the faulting mechanics characterising the Alto Tiberina Fault at depth. The detection of NVT may also be a valid tool to estimate the occurrence of slip acceleration episodes.

We intend to develop codes to detect and locate NVT’s basing on coherence analysis of seismic signals recorded by a group of receivers. We will work also on centroid location by cross-correlating signal from pairs of stations.

References

  1. Obara, K., Hirose, H., Yamamizu, F. and Kasahara, K. (2004). Episodic slow slip events accompanied by non-volcanic tremors in southwest Japan subduction zone. Geophysical Research Letters 31(23): doi: 10.1029/2004GL020848. issn: 0094-8276.

  2. Shelly, D. R., G. C. Beroza, and S. Ide (2007a), Non-volcanic tremor and low-frequency earthquake swarms, Nature, 446, 305 – 307, doi:10.1038/nature05666.

  3. Wech, A. G., and K. C. Creager (2008), Automated detection and location of Cascadia tremor, Geophys. Res. Lett., 35, L20302, doi:10.1029/2008GL035458.

  4. J. L. Rubinstein, D. R. Shelly, W. L. Ellsworth (2010) Non-volcanic Tremor: A Window into the Roots of Fault Zones; New Frontiers in Integrated Solid Earth Sciences – International Year of Planet Earth 2010, pp 287-314.