Evaluation of Dynamic and Kinematic Parameters of November 12, 2017 Sarpol-e Zahab Earthquake in Zagros Region

Document Type : Articles

Authors

1 Seismology Research Center, International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran

2 Seismology Research Centre, International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran

Abstract

The Zagros fold Thrust belt is approximately 1,500 to 1,600 km long and 200 to 300 km wide, formed from western Iran to the Strait of Hormuz under the influence of the convergence of the Arabian and Eurasian plateaus. The faults in this belt are mainly parallel to the folds and are of the thrust type with slopes to the north to the northeast. The Zagros zone is divided into five units based on morpho-tectonic, seismic, and structural data, and it is separated by deep faults called the High Zagros Fault (HZF), Mountain Front Fault (MFF), Zagros Foredeep Fault (ZFF), Main Zagros Reverse Fault (MZRF) and Kazerun Fault (KF). The earthquake of November 12, 2017, which occurred in the Zagros region near to Iran-Iraq border (MW = 7.3), is the only earthquake with a magnitude of more than 7 recorded in the northwestern part of the Zagros Thrust Zone (ZTZ). The largest earthquake in the region near the source of the recent earthquake was the January 11, 1967 earthquake (M = 6.1), located about 100 km south of the epicenter of the 2017 earthquake. The closest city to the epicenter of the recent earthquake is the city of Azgeleh with a distance of approximately 5 km. The depth of the earthquake was also reported to be about 11 km. In this study, using seismic data recorded in the Global Digital Seismic Network (GDSN), the seismic moment of this earthquake was calculated using the Kelis-Borok method and its average value obtained was 1.45E+27 dyne-cm. According to the source time function of this earthquake and obtaining the peak value of the rise time, duration of the most fracturing and fall time, the total rupture time is calculated that is 4.998 seconds.

Keywords

References

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History

  • Receive Date: 09 October 2018
  • Accept Date: 17 April 2021

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