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Scaling relations of moment magnitude, local magnitude,and duration magnitude for earthquakes originated in northeast India

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Earthquake Science 2016年第3期29卷 153-164页

作者： Dipok K.Bora Department of Physics Diphu Government College

In this study, we aim to improve the scaling between the moment magnitude （Mw）, local magnitude （ME）, and the duration magnitude （MD） for 162 earthquakes in Shillong-Mikir plateau and its adjoining region of northeast India by extending the Mw estimates to lower magnitude earthquakes using spectral analysis of P-waves from vertical component seismograms. The Mw-ML and Mw-MD relationships are determined by linear regression analysis. It is found that, Mw values can be considered consistent with ME and My, within 0.1 and 0.2 magnitude units respectively, in 90 % of the cases. The scaling relationships investigated comply well with similar relationships in other regions in the world and in other seismogenic areas in the northeast India region.

关键词： local magnitude Moment magnitude Duration magnitude Shillong-Mikir plateau

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local magnitude Study of the Seismic Activity on Itacarambi,MG

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International Journal of Geosciences 2012年第1期3卷 222-225页

作者： Italo Lopes de Oliveira George Sand Franca Cristiano Naibert Chimpliganond Seismological Observatory University of BrasiliaBrasiliaBrazil

The importance of studying the local magnitude related to seismic activity occurred recently in the region of Itacarambi, state of Minas Gerais, is due to the fact that these were earthquakes of intraplate origin. From the study of [1] and the relation between local magnitude and seismic signal duration, was performed a data analysis obtained in the same region, on the period between October/2007 and June/2008, in which we can estimate the equation MD = 2.153 (±0.072) LogD – 1.925 (±0.132) to calculate the magnitude of local duration. We can also estimate one value for the b parameter using the equation LogN = a – bMD from a frequency-magnitude study. It was found the value of b = 0.826 (±0.020) for the general activity of Itacarambi, MG, that is within the universal range proposed by [2].

关键词： Intraplate Earthquakes local magnitude Duration of Seismic Signal Parameter b

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Determination of the local magnitudes of small earthquakes using a dense seismic array in the Changning-Zhaotong Shale Gas Field,Southern Sichuan Basin

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Earth and Planetary Physics 2021年第6期5卷 532-546页

作者： Wen Yang GuoYi Chen LingYuan Meng Yang Zang HaiJiang Zhang JunLun Li Laboratory of Seismology and Physics of the Earth’s Interior School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China National Geophysical Observatory at Mengcheng University of Science and Technology of ChinaMengcheng Anhui 233500China China Earthquake Networks Center Beijing 100045China

With the development of unconventional shale gas in the southern Sichuan Basin,seismicity in the region has increased significantly in recent *** the existing sparse regional seismic stations can capture most earthquakes with ML≥2.5,a great number of smaller earthquakes are often omitted due to limited detection *** the advent of portable seismic nodes,many dense arrays for monitoring seismicity in the unconventional oil and gas fields have been deployed,and the magnitudes of those earthquakes are key to understand the local fault reactivation and seismic ***,the current national standard for determining the local magnitudes was not specifically designed for monitoring stations in close proximity,utilizing a calibration function with a minimal resolution of 5 km in the epicentral *** is,the current national standard tends to overestimate the local magnitudes for stations within short epicentral distances,and can result in discrepancies for dense *** this study,we propose a new local magnitude formula which corrects the overestimated magnitudes for shorter distances,yielding accurate event magnitudes for small earthquakes in the Changning-Zhaotong shale gas field in the southern Sichuan Basin,monitored by dense seismic arrays in close *** formula is used to determine the local magnitudes of 7,500 events monitored by a two-phased dense array with several hundred 5 Hz 3 C nodes deployed from the end of February 2019 to early May 2019 in the Changning-Zhaotong shale gas *** magnitude of completeness(MC)using the dense array is-0.1,compared to MC 1.1 by the sparser Chinese Seismic Network(CSN).In addition,using a machine learning detection and picking procedure,we successfully identify and process some 14,000 earthquakes from the continuous waveforms,a ten-fold increase over the catalog recorded by CSN for the same period,and the MC is further reduced to-0.3 from-0.1 compared to the catalog obtained via ma

关键词： shale gas development local magnitude microearthquakes dense seismic array machine learning

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Discussion on the Relationship between Different Earthquake magnitude Scales and the Effect of Seismic Station Sites on magnitude Estimation

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Earthquake Research in China 2008年第1期22卷 24-30页

作者： Zhang Hongzhi Diao Guiling Zhao Mingchun Wang Qincai Zhang Xiao Huang Yuan Institute of Geophysics CEA Beijing 100081 China Earthquake Administration of Hebei Province Shijiazhuang 050021 China Earthquake Administration of Tangshan City Tangshan 063000 China）

Based on the earthquake catalog reported by the Chinese digital seismic network in recent years,we select the earthquakes with both surface wave magnitude and local magnitude and fit them into a relationship between the two *** systematic difference is found from the formula which has been used for 30 *** of a large dynamic range and wide frequency range of the current digital observation system,in addition to a larger number of stations and earthquakes being used compared to before,the relation obtained in this paper seems more *** calculation shows that there is no significant difference before and after magnitude conversion so we suggest the abandonment of magnitude *** site response of a station consists of amplification at different *** amplification is equal to about 1 and changes little with frequency at stations located on basement rock,and it is greater than 1 at low frequency ranges and less than 1 at high frequency ranges at stations located on sediment *** difference between magnitudes from single station located on sediment layer and the average magnitude from the whole network increases from negative to positive with *** seems that there is no fixed station correction factor and the station correction method does not work to improve the accuracy and magnitude estimates.

关键词： local magnitude Surface wave magnitude magnitude conversion Site response Station correction

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