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Calibration of the local magnitude scale (M L ) for Peru

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Abstract

We propose a local magnitude scale (M L ) for Peru, based on the original Richter definition, using 210 seismic events between 2011 and 2014, recorded by 35 broadband stations of the National Seismic Network operated by the Geophysical Institute of Peru. In the solution model, we considered 1057 traces of maximum amplitude records on the vertical channel from simulated Wood-Anderson seismograms of shallow events (depths between 0 and 60 km) and hypocentral distances less than 600 km. The attenuation factor has been evaluated in terms of geometrical spreading and anelastic attenuation coefficients. The magnitude M L was defined as M L = L o g 10 A W A +1.5855L o g 10(R/100)+0.0008(R−100)+3±S, where, A W A is the displacement amplitude in millimeters (Wood-Anderson), R is the hypocentral distance (km), and S is the station correction. The results obtained for M L have good correlation with the m b , M s and M w values reported the ISC and NEIC. The anelastic attenuation curve obtained has a similar behavior to that other highly seismic regions. Station corrections were determined for all stations during the regression analysis resulting in values ranging between −0.97 and +0.73, suggesting a strong influence of local site effects on amplitude.

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Acknowledgments

We would like to express our gratitude towards those at the Centro Nacional de Monitoreo Sísmico-Acelerométrico and Centro de Redes Geofísicas, for allowing us to use IGP’s earthquake data, waveform data and the instrumental responses of the RSN. Marcelo Peres Rocha and George Sand França thanks the Brazilian National Counsel of Technological and Scientific Development (CNPq) for Research Productivity Grant. The authors thank the reviewers for their helpful comments and corrections.

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Authors and Affiliations

  1. Ciencias de la Tierra Sólida, Instituto Geofísico del Perú, Lima, Perú

    Cristobal Condori & Hernando Tavera

  2. Instituto de Geociências, Universidade de Brasília, Brasília, DF, Brazil

    Cristobal Condori, Giuliano Sant’Anna Marotta, Marcelo Peres Rocha & George Sand França

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  1. Cristobal Condori
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  2. Hernando Tavera
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  3. Giuliano Sant’Anna Marotta
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  4. Marcelo Peres Rocha
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  5. George Sand França
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Correspondence to Cristobal Condori.

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Condori, C., Tavera, H., Marotta, G.S. et al. Calibration of the local magnitude scale (M L ) for Peru. J Seismol 21, 987–999 (2017). https://doi.org/10.1007/s10950-017-9647-3

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