INDEPTH Wide-Angle Reflection Observation of P-Wave-to-S-Wave Conversion from Crustal Bright Spots in Tibet

Three-component wide-angle seismic data acquired in southern Tibet during Project INDEPTH show strong P-to-S converted reflections from reflectors that are aligned at a depth of ∼15 kilometers beneath the northern Yadong-Gulu rift. These converted reflections are locally higher in amplitude than the...

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Published inScience (American Association for the Advancement of Science) Vol. 274; no. 5293; pp. 1690 - 1691
Main Authors Makovsky, Yizhaq, Klemperer, Simon L., Ratschbacher, Lothar, Brown, Larry D., Li, Ming, Zhao, Wenjin, Meng, Fanle
Format Journal Article
LanguageEnglish
Published Washington, DC American Society for the Advancement of Science 06.12.1996
American Association for the Advancement of Science
The American Association for the Advancement of Science
Subjects
Amplitude
Angle of incidence
Applied geophysics
Crust
Crust (Geology)
Crystalline rocks
Earth
Earth sciences
Earth, ocean, space
Exact sciences and technology
Fluids
Geology
Igneous and metamorphic rocks petrology, volcanic processes, magmas
Internal geophysics
Project INDEPTH
Ratios
Reflectors
Seismic reflection method
Seismic reflection surveying
Xizang China
Far East
China
Himalayas
Qinghai-Xizang Plateau
Tibet
geotraverses
hydrothermal circulation
interfaces
projects
reflectors
velocity structure
fluid phase
P-waves
S-waves
magmas
seismic profiles
continental crust
seismic surveys
granitic composition
brines
amplitude
depth
Asia
wide-angle seismic reflection
conversion
seismic waves
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Summary:Three-component wide-angle seismic data acquired in southern Tibet during Project INDEPTH show strong P-to-S converted reflections from reflectors that are aligned at a depth of ∼15 kilometers beneath the northern Yadong-Gulu rift. These converted reflections are locally higher in amplitude than the corresponding P-wave reflections. Modeling of reflection mode conversion as a function of incidence angle indicates that this condition obtains for a reflector that is a solid over fluid interface; it is not typical of a solid-solid interface. The likely candidates for a fluid trapped within the crystalline crust of southern Tibet are granitic magma and water (brine).
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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ISSN:0036-8075
1095-9203
DOI:10.1126/science.274.5293.1690