Crustal and uppermost mantle structure in Italy from the inversion of P-wave arrival times:: geodynamic implications

被引:91
|
作者
Di Stefano, R [1 ]
Chiarabba, C [1 ]
Lucente, F [1 ]
Amato, A [1 ]
机构
[1] Inst Nazl Geofis, I-00143 Rome, Italy
关键词
crust; geodynamics; Italy; P waves; upper mantle;
D O I
10.1046/j.1365-246x.1999.00952.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
In this paper we present a 3-D image of the P-wave velocity structure in the crust and uppermost mantle beneath Italy, obtained by inverting P-wave arrival times of crustal earthquakes. We used about 48 000 arrival times at stations close to the epicentres (within 200 km) to mitigate the effects of both reading errors and intrinsic complexity for long-distance ray paths due to the scale of heterogeneities in the Earth structure beneath Italy. Whereas two of the inverted layers (located in the lower crust and beneath the Moho) are well resolved by:the data, the upper crustal layer has regions of relatively poor resolution beneath the central Apennines, due to the sparse station spacing. We made several attempts, varying the Moho geometry, to obtain reliable and stable results without introducing too complex and unconstrained a priori information. One of the most important results is the discovery of low-velocity anomalies at 38 km depth beneath the northern Apenninic and Calabrian arcs, which we interpret as subducted crustal material of the Adriatic and Ionian lithospheres. In the lower crust beneath the entire Apennines, a pronounced low-velocity belt is present, suggesting high temperatures in front of the bent Adriatic lithosphere. Based on our results and on those previously obtained from seismic tomography, we propose a model for the geodynamic evolution of the Apenninic system in which the present-day scenario reflects lateral heterogeneities in the subducting Ionian (oceanic) and Adriatic (continental) lithosphere.
引用
收藏
页码:483 / 498
页数:16
相关论文
共 50 条
  • [21] Crustal and uppermost mantle structure of the northeastern Qinghai-Xizang Plateau from joint inversion of surface wave dispersions and receiver functions with P velocity constraints
    Pei Zhang
    Xiaodong Song
    Jiangtao Li
    Xingchen Wang
    Xuezhen Zhang
    Earthquake Science, 2024, 37 (02) : 93 - 106
  • [22] THE CRUSTAL STRUCTURE IN IBERIA INFERRED FROM P-WAVE CODA
    PAULSSEN, H
    VISSER, J
    TECTONOPHYSICS, 1993, 221 (01) : 111 - 123
  • [23] FINE-STRUCTURE BENEATH THE TOHOKU DISTRICT, NORTHEASTERN JAPAN ARC, AS DERIVED BY AN INVERSION OF P-WAVE ARRIVAL TIMES FROM LOCAL EARTHQUAKES
    HASEMI, AH
    ISHII, H
    TAKAGI, A
    TECTONOPHYSICS, 1984, 101 (3-4) : 245 - 265
  • [24] Seismic anisotropy estimated from P-wave arrival times in crosshole measurements
    Wang, Yanghua
    GEOPHYSICAL JOURNAL INTERNATIONAL, 2011, 184 (03) : 1311 - 1316
  • [25] Evidence for serpentinization of the Ionian upper mantle from simultaneous inversion of P- and S-wave arrival times
    D'Alessandro, Antonino
    Mangano, Giorgio
    D'Anna, Giuseppe
    Scudero, Salvatore
    JOURNAL OF GEODYNAMICS, 2016, 102 : 115 - 120
  • [26] P-WAVE VELOCITY OF THE UPPERMOST MANTLE AND CRUSTAL THICKNESS IN THE CENTRAL VANUATU ISLANDS (NEW-HEBRIDES ISLAND-ARC)
    COUDERT, E
    CARDWELL, RK
    ISACKS, BL
    CHATELAIN, JL
    BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA, 1984, 74 (03) : 913 - 924
  • [27] Crustal and uppermost mantle shear wave velocity structure beneath the Middle East from surface wave tomography
    Kaviani, Ayoub
    Paul, Anne
    Moradi, Ali
    Mai, Paul Martin
    Pilia, Simone
    Boschi, Lapo
    Ruempker, Georg
    Lu, Yang
    Tang, Zheng
    Sandvol, Eric
    GEOPHYSICAL JOURNAL INTERNATIONAL, 2020, 221 (02) : 1349 - 1365
  • [28] P-WAVE TRAVEL TIMES FROM SHALLOW EARTHQUAKES RECORDED IN INDIA AND INFERRED UPPER MANTLE STRUCTURE
    KAILA, KL
    REDDY, PR
    NARAIN, H
    BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA, 1968, 58 (06) : 1879 - +
  • [29] Crustal and upper mantle velocity structure beneath central Tibet by P-wave teleseismic tomography
    Zhang, Heng
    Zhao, Junmeng
    Xu, Qiang
    GEOPHYSICAL JOURNAL INTERNATIONAL, 2012, 190 (03) : 1325 - 1334
  • [30] P-Wave Velocity Structure of the Lower Crust and Uppermost Mantle beneath the Sichuan-Yunnan (China) Region
    Wei, Zhi
    Zhao, Li
    SEISMOLOGICAL RESEARCH LETTERS, 2022, 93 (04) : 2161 - 2175