Calibration of the local magnitude scale (ML) for Peru

Cristobal Condori Quispe, Hernando Tavera, Giuliano Sant’Anna Marotta, Marcelo Peres Rocha, George Sand França

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

We propose a local magnitude scale (ML) 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 ML was defined as ML = Log10AWA+1.5855Log10(R/100)+0.0008(R−100)+3±S, where, AWA is the displacement amplitude in millimeters (Wood-Anderson), R is the hypocentral distance (km), and S is the station correction. The results obtained for ML have good correlation with the mb, Ms and Mw 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.

Original languageEnglish
Pages (from-to)987-999
Number of pages13
JournalJournal of Seismology
Volume21
Issue number4
DOIs
StatePublished - 1 Jul 2017
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2017, Springer Science+Business Media Dordrecht.

Keywords

  • Attenuation
  • Local magnitude (M)
  • Peru
  • Station correction
  • Wood-Anderson

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