| Study on in-situ stress measurement around coastal marginal land in Fujian |
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| 作者姓名： | 李宏 安其美 谢富仁 |
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| 作者单位： | Institute of Crustal Dynamics，China Earthquake Administration Beijing 100085，China，Institute of Crustal Dynamics，China Earthquake Administration Beijing 100085，China，Institute of Crustal Dynamics，China Earthquake Administration Beijing 100085，China |
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| 基金项目： | National Development and Reform Commission [2004]1138. |
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| 摘 要： | Introduction The southeast coastal margin of Chinese mainland is important to understand the mutual movement, matter exchange and energy transfer between ocean and land lithospheres, as well as their effects. The coastal area in Fujian Province is advanced in economy development but it has frequent earthquakes, or even strong earthquakes. Therefore, the current study on in-situ stress state measurement is of great significance for studying continental dynamics, marginal sea dy- namics, seismo…
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| 收稿时间： | 1 February 2005 |
| 修稿时间： | 7 June 2005 |
Study on in-situ stress measurement around coastal marginal land in Fujian |
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| LI Hong,AN Qi-mei,XIE Fu-ren.Study on in-situ stress measurement around coastal marginal land in Fujian[J].Acta Seismologica Sinica(English Edition),2005,18(5):544-551. |
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| Authors: | LI Hong AN Qi-mei XIE Fu-ren |
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| Institution: | Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China |
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| Abstract: | The in-situ hydraulic fracturing stress measurements have been carried out around the coastal marginal land in Fujian Province.
And the characteristics of magnitude, direction and distribution of tectonic stress have been obtained. Based on the observed
stress data, the characteristics and activities of fault zones are analyzed and studied in the paper according to the Coulomb
friction criteria. (1) The maximum horizontal principal compressive stress is in the NW-WNW direction from the north to the
south along the coastline verge, which is parallel to the strike of the NW-trending fault zone, consistent with the direction
of principal compressive stress obtained from geological structure and across-fault deformation data, and different from that
reflected by focal mechanism solution by about 20°. (2) The horizontal principal stress increases with depth, the relation
among three stresses is S
H>S
v>S
h or S
H≈S
v>S
h, and the stress state is liable to normal fault and strike-slip fault activities. (3) According to Coulomb friction criteria
and taking the friction strength μ as 0.6–1.0 for analysis, the stress state reaching or exceeding the threshold for normal-fault
frictional sliding near the fault implies that the current tectonic activity in the measuring area is mainly normal faulting.
(4) The force source of current tectonic stress field comes mainly from the westward and northwestward horizontal extrusions
from the Pacific and Philippine Plates respectively to the Eurasian Plate.
Foundation item: National Development and Reform Commission 2004] 1138.
Contribution No. 2005A012, Institute of Crustal Dynamics, China Earthquake Administration. |
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| Keywords: | Fujian coast active fault zone hydraulic fracturing stress measurement Coulomb friction criteria |
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