Mantle processes;
Body waves;
Intra-plate processes;
Dynamics of lithosphere and mantle;
CENTRAL-EUROPE;
SEISMIC EVIDENCE;
LITHOSPHERE;
LOCATION;
BASIN;
RIFT;
D O I:
10.1111/j.1365-246X.2011.05155.x
中图分类号:
P3 [地球物理学];
P59 [地球化学];
学科分类号:
0708 ;
070902 ;
摘要:
The western Bohemian Massif is known for geodynamic phenomena such as earthquake swarms, CO2 dominated free gas emanations of upper-mantle origin, and Tertiary/ Quaternary volcanism. Among other explanations, a small-scale mantle plume has been suggested. We used data from the international passive seismic experiment BOHEMA (2001-2004) and of a previous seismic experiment to investigate the structure of the upper-mantle discontinuities at 410 km and 660 km depth (the '410' and the '660') beneath the Bohemian Massif with the P receiver function method. More than 4500 high-quality receiver function traces could be utilized. Two stacking techniques were used: stacking by station (common station method, CSM) and stacking by piercing points in the mantle transition zone (common conversion point method, CCM). Since the station spacing is very close, rays from different stations have similar piercing points in the mantle transition zone. Therefore CCM is sensitive in the transition zone and CSM is sensitive to the uppermost structure of the mantle. The CSM shows delayed conversion times from the 410 km discontinuity beneath the western Bohemia earthquake region, which indicate a slow uppermost mantle. When stacking our data by CCM, we observe thickening of the transition zone towards the Alpine foreland, which agrees with tomographic results by Piromallo and Morelli. The thickness of the mantle transition zone beneath the western Bohemian Massif is normal, with a faint hint to thinning in the northern part. Our conclusion is that a plume-like structure may exist in the upper mantle below the western Bohemia earthquake region, but with no or only weak imprint on the 410 km discontinuity.
机构:
Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou, Guangdong, Peoples R ChinaChinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou, Guangdong, Peoples R China
Huang, Haibo
Tosi, Nicola
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机构:
Tech Univ Berlin, Dept Astron & Astrophys, Berlin, Germany
German Aerosp Ctr DLR, Dept Planetary Phys, Berlin, GermanyChinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou, Guangdong, Peoples R China
Tosi, Nicola
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Chang, Sung-Joon
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Xia, Shaohong
Qiu, Xuelin
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Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou, Guangdong, Peoples R ChinaChinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou, Guangdong, Peoples R China
机构:
Missouri Univ Sci & Technol, Min Engn Dept, Rolla, MO 65409 USA
Benghazi Univ, Fac Sci, Dept Earth Sci, Benghazi, LibyaMissouri Univ Sci & Technol, Min Engn Dept, Rolla, MO 65409 USA
Lemnifi, Awad A.
Browning, John
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机构:
Pontificia Univ Catolica Chile, Dept Min Engn, Santiago, Chile
Pontificia Univ Catolica Chile, Dept Struct & Geotech Engn, Santiago, ChileMissouri Univ Sci & Technol, Min Engn Dept, Rolla, MO 65409 USA
Browning, John
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Elshaafi, Abdelsalam
Aouad, Nassib S.
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Missouri Univ Sci & Technol, Min Engn Dept, Rolla, MO 65409 USAMissouri Univ Sci & Technol, Min Engn Dept, Rolla, MO 65409 USA
Aouad, Nassib S.
Yu, Y.
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机构:
Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R ChinaMissouri Univ Sci & Technol, Min Engn Dept, Rolla, MO 65409 USA
机构:
Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R ChinaChinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
Zhao, Liang
Yuan, Huaiyu
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Macquarie Univ, ARC Ctr Excellence Core Crust Fluid Syst, Dept Earth & Environm Sci, N Ryde, NSW, Australia
Univ Western Australia, Ctr Explorat Targeting, Sch Earth Sci, Perth, WA, AustraliaChinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
Yuan, Huaiyu
Sun, Weijia
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机构:
Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R ChinaChinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
Sun, Weijia
Xiao, Wenjiao
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Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China
Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Xinjiang Res Ctr Mineral Resources, Urumqi, Peoples R ChinaChinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China