Seismological study on the crustal structure of Tengchong volcanic-geothermal area

Based upon the deep seismic sounding profile conducted in the Tengchong volcanic-geothermal area, a two-dimensional crustal P velocity structure is obtained by use of the finite-difference inversion and the forward travel-time fitting method. The crustal model shows that there is a low velocity zone...

Full description

Saved in:
Bibliographic Details
Published in:Acta seismologica sinica 2002-05, Vol.15 (3), p.247-259
Main Authors: Wang, Chun-young, Lou, Hai, Wu, Jian-ping, Bai, Zhi-ming, Huangfu, Gang, Qin, Jia-zheng
Format: Article
Language:English
Subjects:
Anomalies
area
Boundaries
crustal
Crusts
deep
Fault lines
Faults
fitting
Geology
Heat flow
Magma
Mantle
seismic
Seismic engineering
Seismic phenomena
sounding
structure
teleseismic
Tengchong
Travel time
Upper mantle
Velocity
volcanic
Volcanic eruptions
Volcanoes
Wave velocity
waveform
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Based upon the deep seismic sounding profile conducted in the Tengchong volcanic-geothermal area, a two-dimensional crustal P velocity structure is obtained by use of the finite-difference inversion and the forward travel-time fitting method. The crustal model shows that there is a low velocity zone in upper crust in the Tengchong area, which may be related to the volcanic-geothermal activities, and two intracrustal faults (the Longling-Ruili fault and Tengchong fault) exist on the profile, where the Tengchong fault may extend to the Moho discontinuity. Meanwhile, based on teleseismic data recorded by a temporary seismic network, we obtained the S-wave velocity structures beneath the Rehai-Retian region in the Tengchong area, which show the low S-wave velocity anomaly in upper crust. The authors discuss the causes of Tengchong volcanic eruption based on the deep crustal structure. The crustal structure in the Tengchong volcanic-geothermal area is characterized by low P-wave and S-wave velocity, low resistivity, high heat-flow value and low Q value. The P-wave velocity in the upper mantle is also low. For this information, it can be induced that the magma in the crust is derived from the upper mantle, and the low velocity anomaly in upper crust in the Tengchong area may be related to the differentiation of magma. The Tengchong volcanoes are close to an active plate boundary and belong to "plate boundary" volcanoes.
ISSN:1000-9116
1674-4519
1993-1344
1867-8777
DOI:10.1007/s11589-002-0057-3