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  • 1
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    Characterization of the San Jacinto fault zone near Anza, California, by fault zone trapped waves (2001)
    In:  J. Geophys. Res., Chengdu, Sichuan, China, 4, vol. 106, no. B12, pp. 30671-30688, pp. 1334, (ISSN: 1340-4202)
    Details
    Publication Date: 2001
    Keywords: Seismology ; Fault zone ; Channel waves ; Quality factor ; 7205 ; Seismology ; Continental ; crust ; (1242) ; 7209 ; Earthquake ; dynamics ; and ; mechanics ; 7223 ; Seismic ; hazard ; assessment ; and ; prediction ; 7230 ; Seismicity ; and ; seismotectonics ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Large teleseismic P wavefront deflections observed with broadband arrays (2003)
    In:  Bulletin of the Seismological Society of America, Wiesbaden, Franz Steiner Verlag GmbH, vol. 93, no. 2, pp. 747-756, pp. L10308, (ISSN: 1340-4202)
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    Publication Date: 2003
    Keywords: Teleseismic events ; P-waves ; Broad-band ; Seismic arrays ; Seismology ; Wave propagation ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    An evolutionary programming method for estimating layered velocity structure (1998)
    In:  Bull. Seism. Soc. of America, London, Dt. Geophys. Ges. e. V., vol. 88, no. 4, pp. 1023-1035, pp. L06304, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1998
    Keywords: Data analysis / ~ processing ; Layers ; Velocity depth profile ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Breathing of the seafloor; tidal correlations of seismicity at Axial Volcano (2002)
    In:  Geology, Warszawa, EGS, vol. 30, no. 6, pp. 503-506, pp. B05S16, (ISSN: 1340-4202)
    Details
    Publication Date: 2002
    Keywords: Volcanology ; Stress ; ocean ; TIDES ; Seismicity ; Statistical investigations ; Juan ; de ; Fuca ; ridge ; Fluids ; cracks and fractures (.NE. fracturing) ; Seismology ; Correlation
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
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    Rupture directivity of small earthquakes at Parkfield (2013)
    Wiley
    Details
    Publication Date: 2013-02-01
    Description: [1]  Theoretical modeling of strike-slip ruptures along a bimaterial interface suggests that earthquakes initiating on the interface will have a preferred rupture direction. We test this model with 450 small earthquakes (2 〈  M  〈 5) from Parkfield, California, to look for evidence of consistent rupture directivity along the San Andreas Fault. We analyze azimuthal variations in earthquake source spectra after applying an iterative correction for wave propagation effects. Our approach avoids directly modeling source spectra because these models generally assume symmetric rupture; instead, we look for azimuthal variations in the amplitudes of the source spectra over specified frequency bands. Our overall results show similar proportions of events exhibiting characteristics of rupture directivity toward either the southeast or northwest. However, the proportion of events with southeast rupture directivity increases as we limit the data set to larger magnitudes, with 70% of the 46 events M  〉 3 exhibiting southeast rupture characteristics. Some spatial and temporal variability in rupture directivity is also apparent. We observe a higher proportion of northwest directivity ruptures following the 2004  M 6 Parkfield earthquake, which ruptured toward the northwest. Our results are generally consistent with the preferred southeast rupture directivity model but suggest that directivity is likely due to several contributing factors.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 6
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    Spatial variations of shear-wave anisotropy near the San Jacinto fault zone in Southern California (2015)
    Wiley
    Details
    Publication Date: 2015-11-01
    Description: We examine crustal anisotropy at several scales along and across the San Jacinto Fault Zone (SJFZ) by systematically measuring shear wave splitting (SWS) parameters. The analyzed data are recorded by 86 stations during 2012–2014, including five linear dense arrays crossing the SJFZ at different locations, and other autonomous stations within 15 km from the main fault trace. Shear phase arrivals and SWS parameters (fast directions and delay times) are obtained with automated methods. The measurements quality is then assessed using multiple criteria, resulting in 23,000 high quality measurements. We find clear contrast of fast directions between the SW and NE sides of the SJFZ. Stations on the SW side have fast directions consistent overall with the maximum horizontal compression direction (SHmax), while stations on the NE side show mixed patterns likely reflecting lithological/topographic variations combined with fault zone damage. The fast directions in the Anza gap section with relatively simple fault geometry agree with the inferred SHmax, and the delay times at an array within that section are smaller than those observed at other across-fault arrays. These indications of less pronounced damage zone in the Anza section compared to other segments of the SJFZ are correlated generally with geometrical properties of the surface traces. Significant variations of fast directions on several across-fault arrays, with station spacing on the orders of a few tens of meters, suggest that shallow fault structures and near-surface layers play an important role in controlling the SWS parameters.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 7
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    A detailed earthquake catalog for the San Jacinto fault‐zone region in southern California (2019)
    Wiley
    Details
    Publication Date: 2019
    Description: Abstract We develop an automated processing procedure to derive a new catalog of earthquake locations, magnitudes and potencies, and analyze nine years of data between 2008 and 2016 in the San Jacinto fault zone region. Our procedure accounts for detailed 3D velocity structure using a probabilistic global‐search location inversion, and obtains high‐precision relative event locations using differential travel times measured by cross‐correlating waveforms. The obtained catalog illuminates spatiotemporal seismicity patterns in the fault zone with observations for 108,800 earthquakes in the magnitude range ‐1.8 to 5.4. Inside a focus region consisting of an 80‐km by 50‐km rectangle oriented parallel to the main fault trace, we estimate a 99% detection rate of earthquakes with magnitude 0.6 and greater, and detect and locate about 60% more events than those present in the Southern California Seismic Network catalog. The results provide the most complete catalog available for the focused study region during the analyzed period, and include both deeper events and very shallow patches of seismicity not present in the regional catalog. The seismicity exhibits a variety of complex patterns that contain important information on deformation processes in the region. The fraction of event pairs with waveforms having cross‐correlation coefficients ≥0.95 is only about 3%, indicating diverse processes operating in the fault zone.
    Print ISSN: 2169-9313
    Electronic ISSN: 2169-9356
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 8
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    Seismicity around the Hawaiian Islands Recorded by the PLUME Seismometer Networks: Insight into Faulting near Maui, Molokai, and Oahu (2011)
    Seismological Society of America (SSA)
    Details
    Publication Date: 2011-08-01
    Description: Instrumental limitations have long prevented the detailed characterization of offshore earthquakes around the Hawaiian Islands, and little is known about the spatial distribution of earthquakes in regions outside the vicinity of the well-monitored island of Hawaii. Here, we analyze data from the deployment of two successive networks of ocean-bottom seismometers (OBSs) as part of the Plume-Lithosphere Undersea Melt Experiment (PLUME) to better determine seismicity patterns along the Hawaiian Islands and their offshore regions. We find that earthquake detection rates are improved when seismograms are high-pass filtered above [~]5 Hz to reduce the background seismic noise. Hypocentral solutions have been determined for 1147 previously undetected microearthquakes, and an additional 2880 events correspond to earthquakes already in the catalog of the United States Geological Survey (USGS) Hawaiian Volcano Observatory (HVO). The spatial patterns of earthquakes identified solely on the PLUME network provide complementary information to patterns identified by the HVO network. A diffuse pattern of seismicity is found to the southeast of the island of Hawaii, and clusters of earthquakes are located west of the island. Many microearthquakes are observed in the vicinity of Maui and Molokai, including some located at mantle depths. A small number of microearthquakes are found to occur near Oahu. There is no evidence from our analyses that the Molokai fracture zone (MFZ) is seismically active at this time, and no evidence was found of a previously hypothesized Diamond Head fault (DHF) near Oahu. However, on the basis of both the PLUME and HVO locations, there is a northeast-southwest-trending swath of epicenters extending northeastward of Oahu that may indicate the locus of moderate-sized historic earthquakes attributed to the Oahu region.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences , Physics
    Published by Seismological Society of America (SSA)
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  • 9
    Electronic Resource
    Electronic Resource
    3-D velocity structure of the San Jacinto fault zone near Anza, California—I. P waves (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 119 (1994), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Seismic arrival times from microearthquakes (ML 〈 4) on the San Jacinto fault near Anza, California, are used to find spatial variations in the seismic velocity that are related to the crustal structure of the fault zone. Preliminary modelling of the 1-D P-wave velocity structure of the upper 25 km of crust reveals that most of the variation in velocity is lateral rather than depth dependent. The traveltime anomalies due to lateral structure can be partially compensated for by applying station corrections, however the variance of the traveltime residuals is still 2.25 times larger than the variance of the picking error. The spatially correlated residuals show that this variance is due to localized velocity anomalies and that the data require further modelling using a 3-D velocity structure.Because the 3-D inverse problem is non-unique, smoothness constraints are applied to find the model that has the minimum structure required to fit the data to the picking error, where a smooth model is defined such that the gradient of the velocity perturbation from the original 1-D model is small. With small non-zero station corrections, a 3-D velocity model can be found that fits the data well. The structure is well resolved from 3 to 9 km depth where lateral perturbations of up to 7 per cent are determined independently of the trade-off between station corrections and poorly resolved near surface structure. The model shows a horizontal gradient with overall faster velocities in the north-east side of the fault zone. At 3–6 km depth, the signature of the fault zone is evident in the lower velocities beneath the surface trace of the fault. However, at 9 km depth. higher seismic velocities are found extending into the fault zone from the north-east block. This higher velocity region occurs where there is a distinct lack of seismicity on the fault. There is also a localized feature in the south-west of the modelled region that is more than 10 km from the main trace of the fault with velocities 3 per cent slower than average.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1994.tb00145.x
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    Paper (German National Licenses)
    Fulltext
  • 10
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    Multipurpose acoustic networks in the integrated Arctic Ocean observing system (2015)
    Arctic Institute of North America
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © Arctic Institute of North America, 2015. This article is posted here by permission of Arctic Institute of North America for personal use, not for redistribution. The definitive version was published in Arctic 68, supple.1 (2015): 11-27, doi:10.14430/arctic4449.
    Description: The dramatic reduction of sea ice in the Arctic Ocean will increase human activities in the coming years. This activity will be driven by increased demand for energy and the marine resources of an Arctic Ocean accessible to ships. Oil and gas exploration, fisheries, mineral extraction, marine transportation, research and development, tourism, and search and rescue will increase the pressure on the vulnerable Arctic environment. Technologies that allow synoptic in situ observations year-round are needed to monitor and forecast changes in the Arctic atmosphere-ice-ocean system at daily, seasonal, annual, and decadal scales. These data can inform and enable both sustainable development and enforcement of international Arctic agreements and treaties, while protecting this critical environment. In this paper, we discuss multipurpose acoustic networks, including subsea cable components, in the Arctic. These networks provide communication, power, underwater and under-ice navigation, passive monitoring of ambient sound (ice, seismic, biologic, and anthropogenic), and acoustic remote sensing (tomography and thermometry), supporting and complementing data collection from platforms, moorings, and vehicles. We support the development and implementation of regional to basin-wide acoustic networks as an integral component of a multidisciplinary in situ Arctic Ocean observatory.
    Keywords: Arctic observing systems ; Arctic acoustics ; Acoustic tomography ; Cabled networks ; Passive acoustics ; Active acoustics
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
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