Characteristics of geomagnetic regular diurnal variation before Wenchuan earthquake

Ling Zhang; Ai Min Du; Xue Lang; Tie Long Zhang; Dong Mei Yang; Xu Dong Zhao

doi:10.6038/cjg20160317

Characteristics of geomagnetic regular diurnal variation before Wenchuan earthquake

Ling Zhang
, Ai Min Du
, Xue Lang
, Tie Long Zhang
, Dong Mei Yang
, Xu Dong Zhao

National Earthquake Response Support Service
CAS - Institute of Geology and Geophysics
University of Chinese Academy of Sciences
Austrian Academy of Sciences
China Earthquake Administration

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

4 Scopus citations

Abstract

The characteristics of the geomagnetic daily variation before the Wenchuan earthquake (M_L=8) occurring on 2008 May 12 are analyzed by using of the data from ground-based geomagnetic array. The variation of the electromagnetic induced field associated with the geomagnetic daily variation is also discussed. The conclusions are: 1) The morphological characteristics of the geomagnetic diurnal variations observed by Chengdu station(CDP)are similar to that observed by other stations; 2) The ratio of Z/H at CDP is greater than that observed by other neighbor stations, with a maximum of Z/H (>2.5)on April 20; 3) The ratio of Z/H at CDP and Z/H at ENS, RCDP/ENS, increases from April 6, reaches a maximum on April 20, then decreases till May 12. The tendency of variations of RCDP/ENS is more apparent for geomagnetic variations with period of 2-4 h. These results indicate that the geomagnetic variation at CDP is partly associated with the conductivity inner the Earth.

Original language	English
Pages (from-to)	952-958
Number of pages	7
Journal	Acta Geophysica Sinica
Volume	59
Issue number	3
DOIs	https://doi.org/10.6038/cjg20160317
State	Published - 1 Mar 2016
Externally published	Yes

Keywords

Conductivity inner the Earth
Geomagnetic diurnal variation
Wenchuan earthquake

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10.6038/cjg20160317

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title = "Characteristics of geomagnetic regular diurnal variation before Wenchuan earthquake",

abstract = "The characteristics of the geomagnetic daily variation before the Wenchuan earthquake (ML=8) occurring on 2008 May 12 are analyzed by using of the data from ground-based geomagnetic array. The variation of the electromagnetic induced field associated with the geomagnetic daily variation is also discussed. The conclusions are: 1) The morphological characteristics of the geomagnetic diurnal variations observed by Chengdu station(CDP)are similar to that observed by other stations; 2) The ratio of Z/H at CDP is greater than that observed by other neighbor stations, with a maximum of Z/H (>2.5)on April 20; 3) The ratio of Z/H at CDP and Z/H at ENS, RCDP/ENS, increases from April 6, reaches a maximum on April 20, then decreases till May 12. The tendency of variations of RCDP/ENS is more apparent for geomagnetic variations with period of 2-4 h. These results indicate that the geomagnetic variation at CDP is partly associated with the conductivity inner the Earth.",

keywords = "Conductivity inner the Earth, Geomagnetic diurnal variation, Wenchuan earthquake",

author = "Ling Zhang and Du, \{Ai Min\} and Xue Lang and Zhang, \{Tie Long\} and Yang, \{Dong Mei\} and Zhao, \{Xu Dong\}",

year = "2016",

month = mar,

day = "1",

doi = "10.6038/cjg20160317",

language = "英语",

volume = "59",

pages = "952--958",

journal = "Acta Geophysica Sinica",

issn = "0001-5733",

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}

TY - JOUR

T1 - Characteristics of geomagnetic regular diurnal variation before Wenchuan earthquake

AU - Zhang, Ling

AU - Du, Ai Min

AU - Lang, Xue

AU - Zhang, Tie Long

AU - Yang, Dong Mei

AU - Zhao, Xu Dong

PY - 2016/3/1

Y1 - 2016/3/1

N2 - The characteristics of the geomagnetic daily variation before the Wenchuan earthquake (ML=8) occurring on 2008 May 12 are analyzed by using of the data from ground-based geomagnetic array. The variation of the electromagnetic induced field associated with the geomagnetic daily variation is also discussed. The conclusions are: 1) The morphological characteristics of the geomagnetic diurnal variations observed by Chengdu station(CDP)are similar to that observed by other stations; 2) The ratio of Z/H at CDP is greater than that observed by other neighbor stations, with a maximum of Z/H (>2.5)on April 20; 3) The ratio of Z/H at CDP and Z/H at ENS, RCDP/ENS, increases from April 6, reaches a maximum on April 20, then decreases till May 12. The tendency of variations of RCDP/ENS is more apparent for geomagnetic variations with period of 2-4 h. These results indicate that the geomagnetic variation at CDP is partly associated with the conductivity inner the Earth.

AB - The characteristics of the geomagnetic daily variation before the Wenchuan earthquake (ML=8) occurring on 2008 May 12 are analyzed by using of the data from ground-based geomagnetic array. The variation of the electromagnetic induced field associated with the geomagnetic daily variation is also discussed. The conclusions are: 1) The morphological characteristics of the geomagnetic diurnal variations observed by Chengdu station(CDP)are similar to that observed by other stations; 2) The ratio of Z/H at CDP is greater than that observed by other neighbor stations, with a maximum of Z/H (>2.5)on April 20; 3) The ratio of Z/H at CDP and Z/H at ENS, RCDP/ENS, increases from April 6, reaches a maximum on April 20, then decreases till May 12. The tendency of variations of RCDP/ENS is more apparent for geomagnetic variations with period of 2-4 h. These results indicate that the geomagnetic variation at CDP is partly associated with the conductivity inner the Earth.

KW - Conductivity inner the Earth

KW - Geomagnetic diurnal variation

KW - Wenchuan earthquake

UR - https://www.scopus.com/pages/publications/84962618706

U2 - 10.6038/cjg20160317

DO - 10.6038/cjg20160317

M3 - 文章

AN - SCOPUS:84962618706

SN - 0001-5733

VL - 59

SP - 952

EP - 958

JO - Acta Geophysica Sinica

JF - Acta Geophysica Sinica

IS - 3

ER -

Characteristics of geomagnetic regular diurnal variation before Wenchuan earthquake

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Keywords

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