Aftershock series of event February 18, 1996: An interpretation in terms of self‐organized criticality

American Geophysical Union (AGU) - Tập 102 Số B12 - Trang 27407-27420 - 1997
Antoni M. Correig, Mercè Urquizú, Josep Vila, Susanna C. Manrubia

Tóm tắt

An aftershock interevent time series, initiated on February 18, 1996, in the eastern Pyrenees was analyzed. The threshold detection magnitude was set at 1.9, and the series was assumed to be complete for an interval of 77 days. The original time series does not fit Omori's law, probably because of sudden changes in the rate of occurrence, interpreted as an increase in the production rate. When the recorded interevent time series is classified in terms of leading aftershocks (those that satisfy a relaxation process) and cascades (those occurred at a nearly constant rate), the new time series of the leading aftershocks fits Omori's law quite well, with p=0.94. Interpreted in terms of Dietrich's model, the series of leading aftershocks correctly predicts a return time for the main shock of the order of 50 years. To interpret the series of cascades, a minimalist, self‐organized critical model was used. Although it is very simple, the model correctly reproduces the two‐level structure in the observed time series, that is, the sequence of leading aftershocks and a cascade sequence emerging from each aftershock. This model may be given physical justification in terms of the Cochard and Madariaga [1996] nucleation model.

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Tài liệu tham khảo

10.1029/JB094iB11p15635

10.1103/PhysRevA.38.364

10.1029/GM083p0069

10.1103/PhysRevE.49.1151

Burridge R., 1967, Model and theoretical seismicity, Bull. Seismol. Soc. Am., 57, 341, 10.1785/BSSA0570030341

10.1016/0375-9601(89)90624-5

10.1007/BF00876049

10.1029/96JB02095

10.1029/93JB02581

10.1016/0031-9201(90)90002-F

10.1029/JB095iB05p06853

10.1029/92JB01852

Lay T., 1995, Modern Global Seismology

10.1029/96RG02808

10.1029/95JB00044

10.1103/PhysRevA.46.4689

Ogata Y., 1988, Statistical models for earthquake occurrence and residual analysis for point process, J. Am. Stat. Assoc., 83, 9, 10.1080/01621459.1988.10478560

10.1023/A:1009711512921

10.1029/93GL01058

Sornette D., 1992, Critical transitions made self‐organized: A dynamical system feedback mechanism for self‐organized criticality, J. Phys. I, 2, 2065

Suriñach E., 1982, La Sismicidad de la Zona Comprendida Entre 40° N‐44°N y 3°W‐5° E; NE Península Ibérica, Pub, 9

Utsu T., 1961, A statistical study on the occurrence of after‐shocks, Geophys. Mag., 30, 521

10.4294/jpe1952.43.1

Vila J., 1997, The broad band seismic station CAD (Tunel del Cadi, eastern Pyrenees): site characteristics and background noise, Bull. Seism. Soc. Am.

10.1111/j.1365-246X.1987.tb05210.x

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Thông tin xuất bản

American Geophysical Union (AGU)

Tập 102 Số B12

27407-27420

Thông tin tác giả