Seismicity of East Alborz based on accurate earthquake relocation during two decades seismic data

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MALEKI VAHID; HATAMI MOHAMMADREZA; Mottaghi Aliasghar

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Journal: GEOSCIENCES Year:2020 | Volume:29 | Issue:116 Page(s): 111-120

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Title

Seismicity of East Alborz based on accurate earthquake relocation during two decades seismic data

Author(s)

MALEKI VAHID | HATAMI MOHAMMADREZA | Mottaghi Aliasghar | Issue Writer Certificate

Keywords

waveform cross correlationQ1

East AlborzQ1

phase pickingQ1

RelocationQ2

Abstract

In this study, we investigate the seismicity of eastern Alborz based on precise location of the earthquakes during the last two decades. In order to reduce the effect of outliers and low quality data on earthquake location results, during phase reading, weighing has been done. Manual readings of seismic phases for the desired area have been provided with a seismic data bank in which 5461 phases S and 8523 phases have been read, compared to seismic phases read in The Iranian Seismological Center (IRSC) shows a significant increase. Initial location is based on phase picking and initial weights using a nonlinear probabilistic method (Lomax et al, 2000). After calculation of initial location, the double difference method (waldhauser et al, 2000) is used to enhance the earthquake location quality. The earthquake waveform correlation tool is used to re-find the earthquakes. Transparency correlations are performed for events with a similarity of over 70% in a given time window for phase P and S. As a result, using this technique, the phase reading error for the same events reaches its lowest level, resulting in seismic events in re-location with a much higher accuracy than the initial location and location based only on the catalog data. Results of waveform cross correlation shows that in this area, earthquakes with high similarity occurring at in different times. Investigating the location of earthquakes on the Firoozkouh fault and then Chashm fault and Astaneh Fault in the cross sections.

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APA: Copy

MALEKI, VAHID, HATAMI, MOHAMMADREZA, & Mottaghi, Aliasghar. (2020). Seismicity of East Alborz based on accurate earthquake relocation during two decades seismic data. GEOSCIENCES, 29(116 ), 111-120. SID. https://sid.ir/paper/388766/en

Vancouver: Copy

MALEKI VAHID, HATAMI MOHAMMADREZA, Mottaghi Aliasghar. Seismicity of East Alborz based on accurate earthquake relocation during two decades seismic data. GEOSCIENCES[Internet]. 2020;29(116 ):111-120. Available from: https://sid.ir/paper/388766/en

IEEE: Copy

VAHID MALEKI, MOHAMMADREZA HATAMI, and Aliasghar Mottaghi, “Seismicity of East Alborz based on accurate earthquake relocation during two decades seismic data,” GEOSCIENCES, vol. 29, no. 116 , pp. 111–120, 2020, [Online]. Available: https://sid.ir/paper/388766/en

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