Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

Internal structure of the San Jacinto fault zone at the Ramona Reservation, north of Anza, California, from dense array seismic data

Journal Article · · Geophysical Journal International
DOI:https://doi.org/10.1093/gji/ggaa482· OSTI ID:1899388
 [1];  [2];  [3];  [4];  [2];  [5]
  1. Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089, USA
  2. Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093, USA
  3. Department of Earth, Environmental and Planetary Sciences, Rice University, Houston, TX 77005, USA
  4. Department of Geology and Geophysics, University of Utah, Salt Lake City, UT 84112, USA
  5. Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089, USA, Southern California Earthquake Center, University of Southern California, Los Angeles, CA 90089, USA
+ Show Author Affiliations
SUMMARY

We image the internal structure of the San Jacinto fault zone (SJFZ) near Anza, California, with seismic data recorded by two dense arrays (RA and RR) from ∼42 000 local and ∼180 teleseismic events occurring between 2012 and 2017. The RA linear array has short aperture (∼470 m long with 12 strong motion sensors) and recorded for the entire analysed time window, whereas the RR is a large three-component nodal array (97 geophones across a ∼2.4 km × 1.4 km area) that operated for about a month in September–October 2016. The SJFZ at the site contains three near-parallel surface traces F1, F2 and F3 from SW to NE that have accommodated several Mw > 6 earthquakes in the past 15 000 yr. Waveform changes in the fault normal direction indicate structural discontinuities that are consistent with the three fault surface traces. Relative slowness from local events and delay time analysis of teleseismic arrivals in the fault normal direction suggest a slower SW side than the NE with a core damage zone between F1 and F2. This core damage zone causes ∼0.05 s delay at stations RR26–31 in the teleseismic P arrivals compared with the SW-most station, and generates both P- and S-type fault zone trapped waves. Inversion of S trapped waves indicates the core damaged structure is ∼100 m wide, ∼4 km deep with a Q value of ∼20 and 40 per cent S-wave velocity reduction compared with bounding rocks. Fault zone head waves observed at stations SW of F3 indicate a local bimaterial interface that separates the locally faster NE block from the broad damage zone in the SW at shallow depth and merges with a deep interface that separates the regionally faster NE block from rocks to the SW with slower velocities at greater depth. The multiscale structural components observed at the site are related to the geological and earthquake rupture history at the site, and provide important information on the preferred NW propagation of earthquake ruptures on the San Jacinto fault.

Research Organization:
Univ. of California, San Diego, CA (United States); Univ. of Southern California, Los Angeles, CA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC)
Grant/Contract Number:
SC0016520; SC0016527
OSTI ID:
1899388
Alternate ID(s):
OSTI ID: 1852274
Journal Information:
Geophysical Journal International, Journal Name: Geophysical Journal International Journal Issue: 2 Vol. 224; ISSN 0956-540X
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United Kingdom
Language:
English

References (69)

Spatial variations of shear wave anisotropy near the San Jacinto Fault Zone in Southern California journal December 2015
Toward reliable automated estimates of earthquake source properties from body wave spectra: AUTOMATED ESTIMATES OF SOURCE PROPERTIES journal June 2016
Incorporating fault zone head wave and direct wave secondary arrival times into seismic tomography: Application at Parkfield, California: A Vp MODEL FROM FIRST ARRIVAL & DWSA journal March 2013
Characterization of Fault Zones journal March 2003
Geological Observations of Damage Asymmetry in the Structure of the San Jacinto, San Andreas and Punchbowl Faults in Southern California: A Possible Indicator for Preferred Rupture Propagation Direction journal February 2006
Seismic Imaging of a Bimaterial Interface Along the Hayward Fault, CA, with Fault Zone Head Waves and Direct P Arrivals journal February 2014
Ground Motion Prediction Equations in the San Jacinto Fault Zone: Significant Effects of Rupture Directivity and Fault Zone Amplification journal May 2014
Seismic Tomography of the Southern California Plate Boundary Region from Noise-Based Rayleigh and Love Waves journal July 2014
A 21-Event, 4,000-Year History of Surface Ruptures in the Anza Seismic Gap, San Jacinto Fault, and Implications for Long-term Earthquake Production on a Major Plate Boundary Fault journal October 2014
Structural Properties of the San Jacinto Fault Zone at Blackburn Saddle from Seismic Data of a Dense Linear Array journal September 2018
Seismic Imaging of the Southern California Plate Boundary around the South-Central Transverse Ranges Using Double-Difference Tomography journal November 2018
Dynamic ruptures in recent models of earthquake faults journal September 2001
Dynamic rupture on a material interface with spontaneous generation of plastic strain in the bulk journal July 2005
Pulverized fault rocks and damage asymmetry along the Arima-Takatsuki Tectonic Line, Japan journal August 2011
Evidence for a bimaterial interface along the Mudurnu segment of the North Anatolian Fault Zone from polarization analysis of P waves journal April 2012
Discontinuity of the Mozumi–Sukenobu fault low-velocity zone, central Japan, inferred from 3-D finite-difference simulation of fault zone waves excited by explosive sources journal January 2004
Deep structure of the Nojima Fault, southwest Japan, estimated from borehole observations of fault-zone trapped waves journal May 2006
Array seismology: Methods and applications journal January 2002
Modeling of seismic guided waves at the Dead Sea Transform: GUIDED WAVES AT THE DEAD SEA TRANSFORM journal July 2003
Fault slip rates, effects of elastic heterogeneity on geodetic data, and the strength of the lower crust in the Salton Trough region, southern California: SALTON TROUGH KINEMATICS journal September 2005
Structure of the San Andreas Fault at SAFOD from P-wave tomography and fault-guided wave mapping journal January 2006
Geodetic slip rates in the southern San Andreas Fault system: Effects of elastic heterogeneity and fault geometry: SSAF SLIP RATES journal February 2013
A Bimaterial Interface Along the Northern San Jacinto Fault Through Cajon Pass journal November 2018
Imaging the Fault Damage Zone of the San Jacinto Fault Near Anza With Ambient Noise Tomography Using a Dense Nodal Array journal November 2019
Semiautomated Estimates of Directivity and Related Source Properties of Small to Moderate Southern California Earthquakes Using Second Seismic Moments journal April 2020
Seismic guided waves trapped in the fault zone of the Landers, California, earthquake of 1992 journal June 1994
Wrinkle-like slip pulse on a fault between different materials journal January 1997
Properties of seismic fault zone waves and their utility for imaging low-velocity structures journal June 1998
Unstable slippage across a fault that separates elastic media of different elastic constants journal March 1980
The structure of slip-pulses and supershear ruptures driving slip in bimaterial friction journal June 2016
Three-dimensional calculations of fault-zone-guided waves in various irregular structures journal November 2002
A shallow fault-zone structure illuminated by trapped waves in the Karadere-Duzce branch of the North Anatolian Fault, western Turkey journal March 2003
Seismic velocity structure in the Hot Springs and Trifurcation areas of the San Jacinto fault zone, California, from double-difference tomography journal June 2014
Automatic picking of direct P, S seismic phases and fault zone head waves journal August 2014
Basic data features and results from a spatially dense seismic array on the San Jacinto fault zone journal May 2015
An algorithm for automated identification of fault zone trapped waves journal June 2015
Internal structure of the San Jacinto fault zone at Jackass Flat from data recorded by a dense linear array journal March 2017
Internal structure of the San Jacinto fault zone at Blackburn Saddle from seismic data of a linear array journal May 2017
A numerical approach for modelling fault-zone trapped waves journal May 2017
Internal structure of the San Jacinto fault zone in the trifurcation area southeast of Anza, California, from data of dense seismic arrays journal December 2017
Imaging subsurface structures in the San Jacinto fault zone with high-frequency noise recorded by dense linear arrays journal February 2019
The response of two half spaces to point dislocations at the material interface journal June 1990
Simulation of SH - and P-SV -wave propagation in fault zones journal March 1997
Quantitative analysis of seismic fault zone waves in the rupture zone of the 1992 Landers, California, earthquake: evidence for a shallow trapping structure journal December 2003
Constraints on fault slip rates of the southern California plate boundary from GPS velocity and stress inversions journal February 2005
Shallow seismic trapping structure in the San Jacinto fault zone near Anza, California journal September 2005
High-resolution imaging of the Bear Valley section of the San Andreas fault at seismogenic depths with fault-zone head waves and relocated seismicity journal October 2005
Dynamic rupture on a bimaterial interface governed by slip-weakening friction journal May 2006
Imaging the deep structure of the San Andreas Fault south of Hollister with joint analysis of fault zone head and direct P arrivals journal June 2007
Importance of bimaterial interfaces for earthquake dynamics and strong ground motion journal August 2009
Variations of the velocity contrast and rupture properties of M6 earthquakes along the Parkfield section of the San Andreas fault journal February 2010
Diversity of fault zone damage and trapping structures in the Parkfield section of the San Andreas Fault from comprehensive analysis of near fault seismograms: Diversity of fault zone damage at Parkfield journal October 2010
Seismic velocity structures in the southern California plate-boundary environment from double-difference tomography: Tomography of the San Jacinto fault area journal June 2012
Abundant off-fault seismicity and orthogonal structures in the San Jacinto fault zone journal March 2017
Seismic Trapped Modes in the Oroville and San Andreas Fault Zones journal August 1990
San Andreas Fault Zone Head Waves Near Parkfield, California journal March 1991
Seismic and geodetic evidence for extensive, long-lived fault damage zones journal April 2009
Can Seismic Waves Be Trapped inside an Inactive Fault Zone? The Case Study of Nocera Umbra, Central Italy journal August 2002
Seismological Studies at Parkfield IX: Fault-Zone Imaging Using Guided Wave Attenuation journal August 2003
LiDAR and Field Observations of Slip Distribution for the Most Recent Surface Ruptures along the Central San Jacinto Fault journal March 2012
Waveform Relocated Earthquake Catalog for Southern California (1981 to June 2011) journal October 2012
Evidence for Seven Surface Ruptures in the Past 1600 Years on the Claremont Fault at Mystic Lake, Northern San Jacinto Fault Zone, California journal February 2013
Apparent Vertical Moho Offsets under Continental Strike-Slip Faults from Lithology Contrasts in the Seismogenic Crust journal December 2012
An Improved Algorithm for Real‐Time S ‐Wave Picking with Application to the (Augmented) ANZA Network in Southern California journal July 2016
Continuity of the West Napa–Franklin Fault Zone Inferred from Guided Waves Generated by Earthquakes Following the 24 August 2014 M w  6.0 South Napa Earthquake journal November 2016
Velocity contrast across the San Andreas fault in central California: Small-scale variations from P-wave nodal plane distortion journal December 1977
Seismic radiation from an SH line source in a laterally heterogeneous planar fault zone journal August 1990
Multi-wavelet analysis of three-component seismic arrays: Application to measure effective anisotropy at Piñon Flats, California journal June 1999
The TauP Toolkit: Flexible Seismic Travel-time and Ray-path Utilities journal March 1999

Similar Records

Internal structure of the San Jacinto fault zone at Jackass Flat from data recorded by a dense linear array
Journal Article · Mon Mar 06 19:00:00 EST 2017 · Geophysical Journal International · OSTI ID:1535648

Related Subjects

Geochemistry & Geophysics