Relating seismicity to the velocity structure of the San Andreas Fault near Parkfield, CA

被引:7
作者
Lippoldt, Rachel [1 ]
Porritt, Robert W. [2 ]
Sammis, Charles G. [1 ]
机构
[1] Univ Southern Calif, Dept Earth Sci, Los Angeles, CA 90089 USA
[2] Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA
基金
美国国家科学基金会;
关键词
Seismicity and tectonics; Continental tectonics: strike-slip and transform; SURFACE-WAVE TOMOGRAPHY; EARTHQUAKES; TREMOR; CREEP; ANISOTROPY; BENEATH; SYSTEM; NOISE; SLIP;
D O I
10.1093/gji/ggx131
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 central section of the San Andreas Fault (SAF) displays a range of seismic phenomena including normal earthquakes, low-frequency earthquakes (LFE), repeating microearthquakes (REQ) and aseismic creep. Although many lines of evidence suggest that LFEs are tied to the presence of fluids, their geological setting is still poorly understood. Here, we map the seismic velocity structures associated with LFEs beneath the central SAF using surface wave tomography from ambient seismic noise to provide constraints on the physical conditions that control LFE occurrence. Fault perpendicular sections show that the SAF, as revealed by lateral contrasts in relative velocities, is contiguous to depths of 50 km and appears to be relatively localized at depths between about 15 and 30 km. This is consistent with the hypothesis that LFEs are shear-slip events on a deep extension of the SAF. We find that along strike variations in seismic behaviour correspond to changes in the seismic structure, which support proposed connections between fluids and seismicity. LFEs and REQs occur within low-velocity structures, suggesting that the presence of fluids, weaker minerals, or hydrous phase minerals may play an important role in the generation of slow-slip phenomena.
引用
收藏
页码:1740 / 1745
页数:6
相关论文
共 41 条
[31]   Delayed dynamic triggering of deep tremor along the Parkfield-Cholame section of the San Andreas Fault following the 2014 M6.0 South Napa earthquake [J].
Peng, Zhigang ;
Shelly, David R. ;
Ellsworth, William L. .
GEOPHYSICAL RESEARCH LETTERS, 2015, 42 (19) :7916-7922
[32]   Paleoseismic Evidence of the 1890 and 1838 Earthquakes on the Santa Cruz Mountains Section of the San Andreas Fault, near Corralitos, California [J].
Streig, A. R. ;
Dawson, T. E. ;
Weldon, R. J., II .
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA, 2014, 104 (01) :285-300
[33]   Large Earthquake Hazard of the San Jacinto Fault Zone, CA, from Long Record of Simulated Seismicity Assimilating the Available Instrumental and Paleoseismic Data [J].
Zoeller, G. ;
Ben-Zion, Y. .
PURE AND APPLIED GEOPHYSICS, 2014, 171 (11) :2955-2965
[34]   Synthesis of Current Seismicity and Tectonics Along the 1857 Mw7.9 Fort Tejon Earthquake Rupture and the Southernmost San Andreas Fault, California, USA [J].
Hauksson, Egill ;
Jones, Lucile M. ;
Stock, Joann M. ;
Husker, Allen L. .
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 2024, 129 (06)
[35]   Along-Strike Variations in Fault Frictional Properties along the San Andreas Fault near Cholame, California, from Joint Earthquake and Low-Frequency Earthquake Relocations [J].
Harrington, Rebecca M. ;
Cochran, Elizabeth S. ;
Griffiths, Emily M. ;
Zeng, Xiangfang ;
Thurber, Clifford H. .
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA, 2016, 106 (02) :319-326
[36]   Seismic velocity structure and seismicity at the Kairei hydrothermal vent field near the Rodriguez Triple Junction in the Indian Ocean [J].
Sato, Toshinori ;
Takata, Hiroyoshi ;
Morii, Ayato ;
Yamada, Shiho ;
Yamada, Tomoaki ;
Shinohara, Masanao .
TECTONOPHYSICS, 2023, 869
[37]   Large Earthquake Hazard of the San Jacinto Fault Zone, CA, from Long Record of Simulated Seismicity Assimilating the Available Instrumental and Paleoseismic Data [J].
G. Zöller ;
Y. Ben-Zion .
Pure and Applied Geophysics, 2014, 171 :2955-2965
[38]   Timing of Large Earthquakes during the Past 500 Years along the Santa Cruz Mountains Segment of the San Andreas Fault at Mill Canyon, near Watsonville, California [J].
Fumal, Thomas E. .
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA, 2012, 102 (03) :1099-1119
[39]   High-resolution deep tectonic tremor locations beneath the San Andreas Fault near Cholame, California, using the double-pair double-difference location method [J].
Guo, Hao ;
Zhang, Haijiang ;
Nadeau, Robert M. ;
Peng, Zhigang .
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 2017, 122 (04) :3062-3075
[40]   Seismic velocity structure in the Hot Springs and Trifurcation areas of the San Jacinto fault zone, California, from double-difference tomography [J].
Allam, A. A. ;
Ben-Zion, Y. ;
Kurzon, I. ;
Vernon, F. .
GEOPHYSICAL JOURNAL INTERNATIONAL, 2014, 198 (02) :978-999