A ML SCALE FOR LOCAL EARTHQUAKES MAGNITUDE IN THE EASTERN-MIDDLE ALBORZ

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NEMATI M.; GHODS A.R.; GHASSEMI M.R.

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Journal: GEOSCIENCES Year:2015 | Volume:24 | Issue:95 (TECTONIC) Page(s): 115-122

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Title

A ML SCALE FOR LOCAL EARTHQUAKES MAGNITUDE IN THE EASTERN-MIDDLE ALBORZ

Author(s)

NEMATI M. | GHODS A.R. | GHASSEMI M.R. | Issue Writer Certificate

Keywords

LOCAL MAGNITUDEQ2

LOCAL EARTHQUAKEQ2

GEOMETRICAL SPREADINGQ2

ATTENUATIONQ1

EASTERN ALBORZ AND STATION CORRECTIONQ2

Abstract

Due to absence of an appropriate scale for estimation of ML for the earthquakes in eastern Alborz Range, we calculated 1113 synthetic Wood-Anderson peak amplitudes from waveforms of 215 earthquakes recorded by 23 stations at local hypocentral distances. The events were recorded by two local temporary seismological networks installed during 2007 and 2008 by the Geological Survey of Iran (GSI) and the stations of the permanent network of the Institute of Geophysics of University of Tehran (IGUT). Both temporary networks were installed for ML two discontinuous periods of nine months in the eastern- middle Alborz. In order to estimate an empirical ATTENUATION curve for ML amplitudes, A, read from the stations at very short hypocentral distances, we fit a parametric relationship to the peak amplitude readings while considering GEOMETRICAL SPREADING, intrinsic ATTENUATION and stations corrections. We obtained the following empirical ATTENUATION relationship:log Aij =1.986 log [rij/100]-0.00452 (Rij-100) -3+SjWhere R is hypocentral distance in km between the jth station pair and ith earthquake and Sj is value of station correction for the jth station The realtionship clearly indicates a larger ATTENUATION for shear waves in short hypocentral distances below 20 km. Our new ML relationship implies ML that using ML relationship derived for hypocentral distances larger than 50 km would overestimate ML magnitude of events recorded by our local networks by about half of unit magnitude. Thus we suggest that for local networks in other regions lacking any local ML relationship, ML relationship derived in this study to be used.

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APA: Copy

NEMATI, M., GHODS, A.R., & GHASSEMI, M.R.. (2015). A M_L SCALE FOR LOCAL EARTHQUAKES MAGNITUDE IN THE EASTERN-MIDDLE ALBORZ. GEOSCIENCES, 24(95 (TECTONIC)), 115-122. SID. https://sid.ir/paper/31301/en

Vancouver: Copy

NEMATI M., GHODS A.R., GHASSEMI M.R.. A M_L SCALE FOR LOCAL EARTHQUAKES MAGNITUDE IN THE EASTERN-MIDDLE ALBORZ. GEOSCIENCES[Internet]. 2015;24(95 (TECTONIC)):115-122. Available from: https://sid.ir/paper/31301/en

IEEE: Copy

M. NEMATI, A.R. GHODS, and M.R. GHASSEMI, “A M_L SCALE FOR LOCAL EARTHQUAKES MAGNITUDE IN THE EASTERN-MIDDLE ALBORZ,” GEOSCIENCES, vol. 24, no. 95 (TECTONIC), pp. 115–122, 2015, [Online]. Available: https://sid.ir/paper/31301/en

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