The first ML scale for North of Vietnam

Le Minh Nguyen; Ting Li Lin; Yih Min Wu; Bor Shouh Huang; Chien Hsin Chang; Win Gee Huang; Tu Son Le; Van Toan Dinh

doi:10.1016/j.jseaes.2010.07.005

The first M_L scale for North of Vietnam

Le Minh Nguyen, Ting Li Lin, Yih Min Wu, Bor Shouh Huang, Chien Hsin Chang, Win Gee Huang, Tu Son Le, Van Toan Dinh

Department of Earth Sciences

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

The first local magnitude scale (M_L) for Northern Vietnam has been derived using a portable broadband seismic network in Northern Vietnam as part of the cooperation between the Vietnam Institute of Geophysics and the Institute of Earth Sciences at Academia Sinica, Taiwan. The composite horizontal peak amplitude data used in this study is comprised a total of 202 amplitude records from 14 broadband stations, which measure 36 shallow earthquakes with focal depths less than 36km, occurred in and around north-western Vietnam during 01/2006-10/2007. The new distance-correction function obtained in this study is -logA0=1.74log(r)+0.00048r-0.522, where A₀ and r are the empirically determined distance correction and hypocentral distance, respectively. This distance-correction relation for Northern Vietnam is quite similar to one for southern California, implying relative efficient attenuation with distances. The correlation between the new M_L and duration magnitudes (M_d), which is still being used for making the official earthquake bulletin in Vietnam, is expressed as ML=0.955M_d+0.17.

Original language	English
Pages (from-to)	279-286
Number of pages	8
Journal	Journal of Asian Earth Sciences
Volume	40
Issue number	1
DOIs	https://doi.org/10.1016/j.jseaes.2010.07.005
Publication status	Published - 2011 Jan 4

All Science Journal Classification (ASJC) codes

Geology
Earth-Surface Processes

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10.1016/j.jseaes.2010.07.005

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title = "The first ML scale for North of Vietnam",

abstract = "The first local magnitude scale (ML) for Northern Vietnam has been derived using a portable broadband seismic network in Northern Vietnam as part of the cooperation between the Vietnam Institute of Geophysics and the Institute of Earth Sciences at Academia Sinica, Taiwan. The composite horizontal peak amplitude data used in this study is comprised a total of 202 amplitude records from 14 broadband stations, which measure 36 shallow earthquakes with focal depths less than 36km, occurred in and around north-western Vietnam during 01/2006-10/2007. The new distance-correction function obtained in this study is -logA0=1.74log(r)+0.00048r-0.522, where A0 and r are the empirically determined distance correction and hypocentral distance, respectively. This distance-correction relation for Northern Vietnam is quite similar to one for southern California, implying relative efficient attenuation with distances. The correlation between the new ML and duration magnitudes (Md), which is still being used for making the official earthquake bulletin in Vietnam, is expressed as ML=0.955Md+0.17.",

author = "Nguyen, {Le Minh} and Lin, {Ting Li} and Wu, {Yih Min} and Huang, {Bor Shouh} and Chang, {Chien Hsin} and Huang, {Win Gee} and Le, {Tu Son} and Dinh, {Van Toan}",

note = "Funding Information: This work was supported by the National Science Council (NSC) of the Republic of China. ",

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doi = "10.1016/j.jseaes.2010.07.005",

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AU - Nguyen, Le Minh

AU - Lin, Ting Li

AU - Wu, Yih Min

AU - Huang, Bor Shouh

AU - Chang, Chien Hsin

AU - Huang, Win Gee

AU - Le, Tu Son

AU - Dinh, Van Toan

N1 - Funding Information: This work was supported by the National Science Council (NSC) of the Republic of China.

PY - 2011/1/4

Y1 - 2011/1/4

N2 - The first local magnitude scale (ML) for Northern Vietnam has been derived using a portable broadband seismic network in Northern Vietnam as part of the cooperation between the Vietnam Institute of Geophysics and the Institute of Earth Sciences at Academia Sinica, Taiwan. The composite horizontal peak amplitude data used in this study is comprised a total of 202 amplitude records from 14 broadband stations, which measure 36 shallow earthquakes with focal depths less than 36km, occurred in and around north-western Vietnam during 01/2006-10/2007. The new distance-correction function obtained in this study is -logA0=1.74log(r)+0.00048r-0.522, where A0 and r are the empirically determined distance correction and hypocentral distance, respectively. This distance-correction relation for Northern Vietnam is quite similar to one for southern California, implying relative efficient attenuation with distances. The correlation between the new ML and duration magnitudes (Md), which is still being used for making the official earthquake bulletin in Vietnam, is expressed as ML=0.955Md+0.17.

AB - The first local magnitude scale (ML) for Northern Vietnam has been derived using a portable broadband seismic network in Northern Vietnam as part of the cooperation between the Vietnam Institute of Geophysics and the Institute of Earth Sciences at Academia Sinica, Taiwan. The composite horizontal peak amplitude data used in this study is comprised a total of 202 amplitude records from 14 broadband stations, which measure 36 shallow earthquakes with focal depths less than 36km, occurred in and around north-western Vietnam during 01/2006-10/2007. The new distance-correction function obtained in this study is -logA0=1.74log(r)+0.00048r-0.522, where A0 and r are the empirically determined distance correction and hypocentral distance, respectively. This distance-correction relation for Northern Vietnam is quite similar to one for southern California, implying relative efficient attenuation with distances. The correlation between the new ML and duration magnitudes (Md), which is still being used for making the official earthquake bulletin in Vietnam, is expressed as ML=0.955Md+0.17.

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The first M_L scale for North of Vietnam

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