Regression Analysis of Reported Earthquake Precursors. I. Presentation of Data

Niazi, Mansour

doi:10.1007/978-3-0348-6245-5_15

Cited by 1 publication

(1 citation statement)

References 11 publications

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“…Mogi, 1962). Moreover, effects of some other parameters such as faulting styles (Schorlemmer et al, 2005;Nakaya, 2005Nakaya, , 2006, earthquake size (Hamilton and McCloskey, 1997;Ikeya and Huang, 1997;Pacheco et al, 1992), earthquake depth (Wiemer and Wyss 1997), and Geotectonical characteristics (Niazi, 1985) on the seismic b-value have been investigated. Mousavi Bafrouei et al ( 2014) estimated average b-values for the five Seismogenic zones of the Alborz-Azerbaijan, central-east Iran, Kopeh-Dagh, Makran, and Zagros for three time periods of 1900-1963, 1964-1996.…”

Section: Discussionmentioning

confidence: 99%

Spatial and temporal variations in b-value of earthquake magnitude–frequency distributions and crustal stress in north part of the Zagros region

Mousavian

Mostafazadeh

2022

Preprint

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In this paper, high-resolution map of the Gutenberg–Richter b-value and differential stress field and stress drop are provided for the north part of the Zagros region. This region is important because more than 10 earthquakes with magnitude greater than 6 occurred in this region in the past. In order to understand tectonic stress pattern of the region, the catalogue of seismicity between 1900 and 2020 was used (most of the events that could be used in this region) in order to explore the spatial and temporal variations of the b-value, which corresponds to the slope of the frequency-magnitude distribution of the earthquakes. We estimate the differential crustal stress from the b-value using a relationship published by Scholz (GeophytsRes Lett 42:1399–1402, 2015) and focused on estimating b-value first in the whole north of Zagros belt and then in 3 sub regions. For entire north of Zagros and sub regions, the average content of Mc is 4.0 (Based on Kijko-Sellevoll (Bull Seism Soc Am 79(3):645–654, 1989)) and content of b-value in this regions is around 1.03 to 1.12 and the b-value is gradually have lower value, from west to the East of Zagros. In all earlier studies, b-value was estimated for the entire of the Zagros but in this study, we estimated the b-value based on tectonic units of the region. In temporal variation of b-value, one minimum in the diagram of b-value in MFF region can be seen exactly before 12 Nov. 2017Ezgeleh earthquake (Mw=7.3) and another minimum in diagram is related to the 18 August 2014 Mormori earthquake (Mw=6.2). The stress drop was estimated from M0 for north part of the Zagros and compared this value in time period before and after Ezgele earthquake. The stress drop value before and after Ezgeleh earthquake, around the epicenter was changed between 0.024–0.03 before earthquake to 0.13–0.261 MPa after the earthquake respectively. Finally we are calculated the differential stress value in time period before and after Ezgele Earthquake, around the epicenter, and it is changed between 300–322 MPa before earthquake to 238–295 MPa after the earthquake respectively. Also it seems that stress transmitted from north part of the Zagros to the central part of it.

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