Seismic moment rate and earthquake mean recurrence interval in the major tectonic boundaries around Oman

A. Deif, I. El-Hussain

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Owing to the short earthquake history, mathematical relationships were developed for calculating the earthquake recurrence from the rate of slip along the active faults. Based on the slip rate and the well-known Gutenberg-Richter law, various relationships between the earthquake occurrence parameters and the crustal deformation rates were developed. Among those is the widely used Molnar (1979 Bull. Seismol. Soc. Am. 69 115-33) mathematical expression, which is modified in the current study to produce a mathematical model based upon the truncated Gutenberg-Richter model instead of the normal Gutenberg-Richter one. The modified model is then tested and applied for the major tectonic boundaries around the Sultanate of Oman. The seismic moment rate is determined and the seismic hazard in terms of recurrence interval is expressed for the investigated regions. The calculated recurrence interval with moment magnitude 8.1 in the Makran zone is found to be 760 years, while for earthquakes with magnitude equal or greater than 5.8 in the Owen fracture zone is 4.904 years in consistency with the observed data. Recurrence intervals resulting from the original Molnar (1979) model and the current modified model were compared and discussed for the Zagros region.

Original languageEnglish
Pages (from-to)773-783
Number of pages11
JournalJournal of Geophysics and Engineering
Volume9
Issue number6
DOIs
Publication statusPublished - Dec 2012

Fingerprint

Oman
recurrence interval
seismic moment
Tectonics
tectonics
Earthquakes
earthquakes
intervals
moments
earthquake
slip
earthquake recurrence
hazards
crustal deformation
slip rate
mathematical models
Hazards
active fault
fracture zone
seismic hazard

Keywords

  • Oman
  • return period
  • seismic hazard
  • seismic moment
  • slip rate

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Management, Monitoring, Policy and Law
  • Geology
  • Geophysics

Cite this

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abstract = "Owing to the short earthquake history, mathematical relationships were developed for calculating the earthquake recurrence from the rate of slip along the active faults. Based on the slip rate and the well-known Gutenberg-Richter law, various relationships between the earthquake occurrence parameters and the crustal deformation rates were developed. Among those is the widely used Molnar (1979 Bull. Seismol. Soc. Am. 69 115-33) mathematical expression, which is modified in the current study to produce a mathematical model based upon the truncated Gutenberg-Richter model instead of the normal Gutenberg-Richter one. The modified model is then tested and applied for the major tectonic boundaries around the Sultanate of Oman. The seismic moment rate is determined and the seismic hazard in terms of recurrence interval is expressed for the investigated regions. The calculated recurrence interval with moment magnitude 8.1 in the Makran zone is found to be 760 years, while for earthquakes with magnitude equal or greater than 5.8 in the Owen fracture zone is 4.904 years in consistency with the observed data. Recurrence intervals resulting from the original Molnar (1979) model and the current modified model were compared and discussed for the Zagros region.",
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AB - Owing to the short earthquake history, mathematical relationships were developed for calculating the earthquake recurrence from the rate of slip along the active faults. Based on the slip rate and the well-known Gutenberg-Richter law, various relationships between the earthquake occurrence parameters and the crustal deformation rates were developed. Among those is the widely used Molnar (1979 Bull. Seismol. Soc. Am. 69 115-33) mathematical expression, which is modified in the current study to produce a mathematical model based upon the truncated Gutenberg-Richter model instead of the normal Gutenberg-Richter one. The modified model is then tested and applied for the major tectonic boundaries around the Sultanate of Oman. The seismic moment rate is determined and the seismic hazard in terms of recurrence interval is expressed for the investigated regions. The calculated recurrence interval with moment magnitude 8.1 in the Makran zone is found to be 760 years, while for earthquakes with magnitude equal or greater than 5.8 in the Owen fracture zone is 4.904 years in consistency with the observed data. Recurrence intervals resulting from the original Molnar (1979) model and the current modified model were compared and discussed for the Zagros region.

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