We compute high‐precision earthquake locations using southern California pick and waveform data from 1981 to 2005. Our latest results are significantly improved compared our previous catalog by the following: (1) locate events with respect a new crustal P S velocity model three‐dimensional ray tracing, (2) we examine six more years of cross‐correlation for many pairs than last analysis, (3) within similar event clusters method that applies robust fitting obtain best satisfying all...

We obtain precise relative relocations for more than 340,000 southern California earthquakes between 1984 and 2002 by applying the source-specific station-term (SSST) method to existing P-and S-phase picks a differential location about 208,000 events within similar-event clusters identified with waveform cross-correlation.The entire catalog is first relocated using phase picks, reference 1D velocity model, SSST of Richards-Dinger Shearer (2000).We also perform separate Imperial Valley model...

Abstract We present a new three‐dimensional seismic velocity model of the crustal and upper mantle structure for Mauna Loa Kilauea volcanoes in Hawaii. Our is derived from first‐arrival times compressional shear waves about 53,000 events on near Island Hawaii between 1992 2009 recorded by Hawaiian Volcano Observatory stations. The V p generally agrees with previous studies, showing high‐velocity anomalies calderas rift zones low‐velocity fault systems. most significant difference models / s...

Fibrillin-1 and fibrillin-2 constitute the backbone of extracellular filaments, called microfibrils. Fibrillin assembly involves complex multistep mechanisms to result in a periodical head-to-tail alignment Impaired potentially plays role molecular pathogenesis genetic disorders caused by mutations fibrillin-1 (Marfan syndrome) (congenital contractural arachnodactyly). Presently, basic interactions involved fibrillin are obscure. Here, we have generated recombinant full-length human...

We obtain a seismic velocity model of the California crust and uppermost mantle using regional-scale double-difference tomography algorithm.We begin by absolute arrival-time picks to solve for coarse three-dimensional (3D) P (V ) with uniform 30 km horizontal node spacing, which we then use as starting finer-scale inversion applied differential pick times.For computational reasons, split state into 5 subregions grid spacing 10 20 assemble our final statewide V stitching together these local...

We present a new crustal seismic velocity model for southern California derived from P and S arrival times local earthquakes explosions. To reduce the volume of data ensure more uniform source distribution, we compute “composite event” picks 2597 distributed master events that include pick information other within spheres 2 km radius. The approach reduces random picking error maximizes number wave picks. constrain absolute event locations shallow structure, also use controlled sources,...

We identify lowered Vp/Vs ratios near earthquake source regions in southern California using observations from a seismic tomography model and high‐resolution local estimates waveform cross‐correlation data within similar event clusters. The median tomographic ratio is 1.716 ± 0.008 at all the relocated crustal locations, compared to background value of 1.729 0.007 for model, although error overlap slightly. situ 1.673 0.022 clusters suggests that studies are overestimating regions....

Abstract The analysis and interpretation of seismicity from mantle depths to the surface play a key role in understanding how Hawaiian volcanoes work. We present results comprehensive systematic re‐analysis waveforms 130,902 seismic events recorded by U.S. Geological Survey Volcano Observatory permanent network January 1992 March 2009. compute high‐precision relative relocations for 101,390 (77% all considered) using waveform cross correlation cluster analysis, resulting multiyear...

Research Article| October 01, 2013 Three‐Dimensional Seismic Velocity Structure and Precise Earthquake Relocations in the Salton Trough, Southern California Guoqing Lin Division of Marine Geology Geophysics, Rosenstiel School Atmospheric Science, University Miami, Florida 33149 Search for other works by this author on: GSW Google Scholar Author Article Information Publisher: Seismological Society America First Online: 14 Jul 2017 Online ISSN: 1943-3573 Print 0037-1106 Bulletin (2013) 103...

Abstract We combine classic and state‐of‐the‐art techniques to characterize the seismic volcanic features in Coso area southern California. Seismic tomography inversions are carried out map variations of Vp, Vs, Vp/Vs beneath Coso. The velocities top layers our model correlated with surface geological features. Indian Wells Valley, high silica content sediment strata, shows low‐velocity anomalies up 3 km depth, whereas major mountain ranges, such as south Sierra Nevada Argus Range, show...

We compare three relative earthquake location techniques using tests on synthetic data that simulate many of the statistical properties real travel time data. The methods are (1) hypocentroidal decomposition method Jordan and Sverdrup (1981), (2) source‐specific station term (SSST) Richards‐Dinger Shearer (2000), (3) modified double‐difference (DD) Waldhauser Ellsworth (2000). generate a set earthquakes, stations, arrival picks in half‐space velocity models. effect variations caused by...

We develop and test a method to estimate local Vp / Vs ratios for compact similar earthquake clusters using the precise P S differential times obtained waveform cross-correlation. demonstrate how our technique works synthetic data evaluate likely errors arising from near-source takeoff angle differences between waves. use robust misfit function compute both sets several event in southern California, bootstrap resampling approach standard real data. Our has higher resolution than typical...

We revisit the rupture zone of 1989 Mw6.9 Loma Prieta earthquake, central California, by developing high‐resolution three‐dimensional (3‐D) V p and / s models. apply simul2000 inversion method algorithm to a set “composite” events, which have greater number picks per event reduced random picking errors compared with traditional master events. Our final P ‐wave velocity model generally agrees previous studies, showing high body above 6.7 km/s in southeast main shock. The 3‐D model, however,...

An anomalous body with low Vp (compressional wave velocity), Vs (shear and high Vp/Vs anomalies is observed at 8–11 km depth beneath the upper east rift zone of Kilauea volcano in Hawaii by simultaneous inversion seismic velocity structure earthquake locations. We interpret this to be a crustal magma reservoir volcanic pile, similar those widely recognized mid-ocean ridge volcanoes. Combined petrophysical models suggest presence 10% melt cumulate mush. This could have supplied that intruded...

Abstract I present a high-precision earthquake relocation catalog and first-motion focal mechanisms before during the 2019 Ridgecrest sequence in eastern California. obtain phase arrivals, polarities, waveform data from Southern California Earthquake Data Center for more than 24,000 earthquakes with magnitudes varying between −0.7 7.1 1 January to 31 July 2019. first relocate all using arrivals through previously developed 3D seismic-velocity model then improve relative location accuracies...

Abstract We present the high-resolution Parkfield matched filter relocated earthquake (PKD-MR) catalog for 2004 Mw 6 sequence in central California. use high-quality seismic data recorded by borehole High Resolution Seismic Network combined with detection and relocations from cross-correlation derived differential travel times. determine magnitudes of newly detected events computing amplitude ratio between detections templates using a principal component fit. The spans November 2003 to 28...

Mutations in fibrillin-1 lead to Marfan syndrome and some related genetic disorders. Many of the more than 600 mutations currently known eliminate or introduce cysteine residues epidermal growth factor-like modules. Here we report structural functional consequences three selected (R627C, C750G, C926R) fibrillin-1. The have been analyzed by means recombinant polypeptides produced mammalian expression systems. mRNA levels for mutation constructs were similar wild-type levels. All mutated...

The γ-secretase complex, composed of presenilin, anterior-pharynx-defective 1, nicastrin, and presenilin enhancer 2, catalyzes the intramembranous processing a wide variety type I membrane proteins, including amyloid precursor protein (APP) Notch. Earlier studies have revealed that membrane-anchored glycoprotein, plays role in assembly trafficking has been proposed to bind substrates. To gain more insights regarding nicastrin structure function, we generated conformation-specific synthetic...

Research Article| July 18, 2018 The Source‐Specific Station Term and Waveform Cross‐Correlation Earthquake Location Package Its Applications to California New Zealand Guoqing Lin aDepartment of Marine Geosciences, Rosenstiel School Atmospheric Science, University Miami, Florida 33149 U.S.A., glin@rsmas.miami.edu Search for other works by this author on: GSW Google Scholar Author Article Information Publisher: Seismological Society America First Online: 18 Jul Online Issn: 1938-2057 Print...