86 research outputs found
GPS, InSAR, and seismic waveform data for study of 2014 South Napa, California, earthquake
No full textGPS_Brocher_et_al2015.txt : Observed static offsets at CGPS and SGPS sites, respectively, presented by Brocher et al. (2015) determined using GPS time series up to several days after the event
napa_CSK_20140619_20140903_asc.grd : Observed unwrapped COSMO-SkyMed ascending interferogram spanning June 19 - September 3, 2014
napa_CSK_20140726_20140827_desc.grd : Observed unwrapped COSMO-SkyMed descending interferogram spanning July 26 - August 27, 2014
napa_sentinel_20140807_20140831_desc.grd : Observed unwrapped Sentinel descending interferogram spanning August 7 - August 31, 2014
seismic_waveforms.tar.gz : Three-component seismic waveforms in (time (s after origin time), velocity (m/s)) format for 16 stations bandpass filtered between 0.067 and 1.5 Hz. Filenames indicate which velocity component (East, North, or Up=Z) and station name.
Study: "Coseismic slip and early after slip of the M6.0 August 24, 2014 South Napa, California, earthquake" by Fred F. Pollitz, Jessica R. Murray, Sarah E. Minson, Charles W. Wicks, and Jerry L. Svarc. Journal of Geophysical Research, in press</p
Supplementary Dataset and Cascadia Subduction Zone coupling model for Humboldt, CA area
No full text<p>Supplementary data associated with the following publication: </p>
<p>Kathryn Materna, Jessica R. Murray, Fred Pollitz, Jason R. Patton; Slip Deficit Rates on Southern Cascadia Faults Resolved with Viscoelastic Earthquake Cycle Modeling of Geodetic Deformation. <em>Bulletin of the Seismological Society of America</em> 2023; 113 (6): 2505–2518. doi: <a href="https://doi.org/10.1785/0120230007" target="_blank" rel="noopener">https://doi.org/10.1785/0120230007</a></p>
<p>The supplementary dataset includes:</p>
<p>Compiled_Geodesy_Vels.txt: the geodetic velocities used in Figure 1. </p>
<p>model_results_preferred.txt: the fault slip deficit rates for the preferred model in Figure 3. </p>
<p>Lastly, it includes the locking model for the Cascadia Subduction Zone in the preferred model of Figure 3 in two formats. The text file csz_slip_distribution.txt is in a format that describes each patch and slip deficit rate quantitatively, which can be used for subsequent types of slip modeling. On the other hand, the text file csz_model_gmt.txt contains the same information in a simpler, GMT-plottable, multi-segment file. The numbers after the multi-segment delimiters are the total slip deficit rate for each patch in mm/yr. </p>
Mechanical deformation model of the western United States instantaneous strain-rate field
No full textInternational audienceWe present a relationship between the long-term fault slip rates and instantaneous velocities as measured by Global Positioning System (GPS) or other geodetic measurements over a short time span. The main elements are the secularly increasing forces imposed by the bounding Pacific and Juan de Fuca (JdF) plates on the North American plate, viscoelastic relaxation following selected large earthquakes occurring on faults that are locked during their respective interseismic periods, and steady slip along creeping portions of faults in the context of a thin-plate system. In detail, the physical model allows separate treatments of faults with known geometry and slip history, faults with incomplete characterization (i.e. fault geometry but not necessarily slip history is available), creeping faults, and dislocation sources distributed between the faults. We model the western United States strain-rate field, derived from 746 GPS velocity vectors, in order to test the importance of the relaxation from historic events and characterize the tectonic forces imposed by the bounding Pacific and JdF plates. Relaxation following major earthquakes (Mγ 8.0) strongly shapes the present strain-rate field over most of the plate boundary zone. Equally important are lateral shear transmitted across the Pacific-North America plate boundary along ∼1000 km of the continental shelf, downdip forces distributed along the Cascadia subduction interface, and distributed slip in the lower lithosphere. Post-earthquake relaxation and tectonic forcing, combined with distributed deep slip, constructively interfere near the western margin of the plate boundary zone, producing locally large strain accumulation along the San Andreas fault (SAF) system. However, they destructively interfere further into the plate interior, resulting in smaller and more variable strain accumulation patterns in the eastern part of the plate boundary zone. Much of the right-lateral strain accumulation along the SAF system is systematically underpredicted by models which account only for relaxation from known large earthquakes. This strongly suggests that in addition to viscoelastic-cycle effects, steady deep slip in the lower lithosphere is needed to explain the observed strain-rate field
Regional Seismic Wavefield Computation on a 3-D Heterogeneous Earth Model by Means of Coupled Traveling Wave Synthesis
No full textObservations and interpretation of fundamental mode Rayleigh wavefields recorded by the Transportable Array (USArray)
No full textTransient rheology of the upper mantle beneath central Alaska inferred from the crustal velocity field following the 2002 Denali earthquake
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