Numerical simulation of spatial-temporal evolution characteristics of subsurface fluid based on strong body seismogenic model |
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| Authors: | HUI ZHANG ZI-BIN LIANG |
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| Institution: | Lanzhou Institute of Seismology, China Seismological Bureau, Lanzhou 730000, China |
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| Abstract: | Using finite element technique of the plane-strain problem in solid-liquid two-phase medium, we studied the characteristics
of “field precursors” and “focus precursors” of subsurface fluid and their spatial-temporal evolution in case of dip-slip
earthquake. The results show that: (1) the change of ground fluid is slow and the anomaly is not prominent in the early period
which is of elastic accumulation and non-linear; (2) dilatancy emerges and anomaly focus mainly in the source region in the
moderate period which is hardening and of local dilatancy. In the period the focus precursors emerge earlier than the field
precursors; (3) anomalies spread continuously in the source area and new regions with big anomaly emerge out of the source
region in the middle-short period which is of large-scale dilatancy.
Contribution No.LC1999073, Earthquake Research Institute of Lanzhou, China Seismological Bureau.
This subject is supported by the Key Project (95-04-01-01-07) from China Seismological Bureau. |
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| Keywords: | subsurface fluid field precursors source precursors mechanism numerical simulation |
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