Preprints
https://doi.org/10.5194/se-2021-88
https://doi.org/10.5194/se-2021-88

  10 Aug 2021

10 Aug 2021

Review status: this preprint is currently under review for the journal SE.

A functional tool to explore the reliability of micro-earthquake focal mechanism solution for seismotectonic purposes

Guido Maria Adinolfi1, Raffaella De Matteis1, Rita De Nardis2, and Aldo Zollo3 Guido Maria Adinolfi et al.
  • 1Dipartimento di Scienze e Tecnologie, Università del Sannio Via dei Mulini, 59/A, 82100 Benevento, Italy
  • 2Dipartimento di Scienze Psicologiche, della Salute e del Territorio, Università di Chieti-Pescara “G. d’Annunzio”, Via dei Vestini, 32, 66100, Chieti, Italy
  • 3Dipartimento di Fisica, Università di Napoli “Federico II”, Complesso Universitario di Monte S.Angelo, via Cinthia, 80124 Napoli, Italy

Abstract. Improving the knowledge of seismogenic faults requires the integration of geological, seismological, and geophysical information. Among several analyses, the definition of earthquake focal mechanisms plays an essential role in providing information about the geometry of individual faults and the stress regime acting in a region. Fault plane solutions can be retrieved by several techniques operating in specific magnitude ranges, both in the time and frequency domain and using different data.

For earthquakes of low magnitude, the limited number of available data and their uncertainties can compromise the stability of fault plane solutions. In this work, we propose a useful methodology to evaluate how well a seismic network used to monitor natural and/or induced micro-seismicity estimates focal mechanisms as function of magnitude, location, and kinematics of seismic source and consequently their reliability in defining seismotectonic models. To study the consistency of focal mechanism solutions, we use a Bayesian approach that jointly inverts the P/S long-period spectral-level ratios and the P polarities to infer the fault-plane solutions. We applied this methodology, by computing synthetic data, to the local seismic network operated in the Campania-Lucania Apennines (Southern Italy) to monitor the complex normal fault system activated during the Ms 6.9, 1980 earthquake. We demonstrate that the method we propose can have a double purpose. It can be a valid tool to design or to test the performance of local seismic networks and more generally it can be used to assign an absolute uncertainty to focal mechanism solutions fundamental for seismotectonic studies.

Guido Maria Adinolfi et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on se-2021-88', Anonymous Referee #1, 03 Sep 2021
  • RC2: 'Comment on se-2021-88', Anonymous Referee #2, 10 Sep 2021

Guido Maria Adinolfi et al.

Guido Maria Adinolfi et al.

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Short summary
We propose a methodology useful to evaluate 1) the reliability of focal mechanism solution inferred by the inversion of seismological data (as P-wave polarities) 2) the performance the seismic network, operated to monitor natural/induced seismicity, to assess focal mechanism solution. We studied the focal mechanism reliability retrieved by the inversion of data recorded by ISNet, a local dense seismic network that monitors the Irpinia Fault System in Southern Italy.