Search Results - "Schaff, David"

Large-scale relocation of two decades of Northern California seismicity using cross-correlation and double-difference methods by Waldhauser, Felix, Schaff, David P.

“…We simultaneously reanalyzed two decades (1984–2003) of the digital seismic archive of Northern California using waveform cross‐correlation (CC) and…”
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Possible precursory signals in damage zone foreshocks by Savage, Heather M., Keranen, Katie M., P. Schaff, David, Dieck, Caitlin

“…Foreshocks may provide a precursory signal of an impending earthquake, but their role in nucleation of the main shock is unclear. One way to further our…”
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A Comprehensive Search for Repeating Earthquakes in Northern California: Implications for Fault Creep, Slip Rates, Slip Partitioning, and Transient Stress by Waldhauser, Felix, Schaff, David P.

“…Repeating earthquakes, earthquakes that rupture the same fault patch more than once, are playing an important role in the study of source processes and fault…”
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Volcanic Precursor Revealed by Machine Learning Offers New Eruption Forecasting Capability by Wang, Kaiwen, Waldhauser, Felix, Tolstoy, Maya, Schaff, David, Sawi, Theresa, Wilcock, William S. D., Tan, Yen Joe

“…Seismicity at active volcanoes provides crucial constraints on the dynamics of magma systems and complex fault activation processes preceding and during an…”
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On finding and using repeating seismic events in and near China by Schaff, David P., Richards, Paul G.

“…A comprehensive search for repeating seismic events was performed using cross correlation on waveforms for 17,898 seismic events in and near China reported in…”
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Broad-scale applicability of correlation detectors to China seismicity by Schaff, David P.

“…It is demonstrated that cross‐correlation methods can successfully be applied on a large scale to the detection of seismic events arising in a variety of…”
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Fault Planes, Fault Zone Structure and Detachment Fragmentation Resolved With High‐Precision Aftershock Locations of the 2016–2017 Central Italy Sequence by Waldhauser, Felix, Michele, Maddalena, Chiaraluce, Lauro, Di Stefano, Raffaele, Schaff, David P.

“…Three devastating earthquakes of MW ≥ 5.9 activated a complex system of high‐angle normal, antithetic, and sub‐horizontal detachment faults during the…”
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Regional and teleseismic double-difference earthquake relocation using waveform cross-correlation and global bulletin data by Waldhauser, Felix, Schaff, David

“…We have developed a double‐difference algorithm to relocate earthquakes recorded at global seismic networks, using differential arrival times for first and…”
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Repeating Seismic Events in China by Schaff, David P., Richards, Paul G.

“…About 10% of seismic events in and near China from 1985 to 2000 were repeating events not more than about 1 kilometer from each other. We cross-correlated…”
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A rare foreshock sequence of the 20 January 2007 Odaesan, Korea, earthquake to measure the existence of preseismic velocity changes by Schaff, David P., Kim, Won-Young

“…Dilatancy theory and laboratory studies predict that there may be changes in the velocity of seismic waves in the Earth's crust preceding large earthquakes due…”
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A comprehensive suite of earthquake catalogues for the 2016-2017 Central Italy seismic sequence by Chiaraluce, Lauro, Michele, Maddalena, Waldhauser, Felix, Tan, Yen Joe, Herrmann, Marcus, Spallarossa, Daniele, Beroza, Gregory C., Cattaneo, Marco, Chiarabba, Claudio, De Gori, Pasquale, Di Stefano, Raffaele, Ellsworth, William, Main, Ian, Mancini, Simone, Margheriti, Lucia, Marzocchi, Warner, Meier, Men-Andrin, Scafidi, Davide, Schaff, David, Segou, Margarita

“…The protracted nature of the 2016-2017 central Italy seismic sequence, with multiple damaging earthquakes spaced over months, presented serious challenges for…”
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Coseismic and postseismic velocity changes measured by repeating earthquakes by Schaff, David P., Beroza, Gregory C.

“…Repeating earthquakes that rupture approximately the same fault patch and have nearly identical waveforms are a useful tool for measuring temporal changes in…”
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Seismological Constraints on Proposed Low-Yield Nuclear Testing in Particular Regions and Time Periods in the Past, with Comments on "Radionuclide Evidence for Low-Yield Nuclear Testing in North Korea in April/May 2010" by Lars-Erik De Geer by Schaff, David P., Kim, Won-Young, Richards, Paul G.

“…We have attempted to detect seismic signals from small explosions in North Korea on five specific days in 2010 that feature in scenarios proposed by De Geer…”
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Wide-scale detection of earthquake waveform doublets and further evidence for inner core super-rotation by Zhang, Jian, Richards, Paul G., Schaff, David P.

“…We report on more than 100 earthquake waveform doublets in five subduction zones, including an earthquake nest in Bucaramanga, Colombia. Each doublet is…”
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High-resolution image of Calaveras Fault seismicity by Schaff, David P., Bokelmann, Götz H. R., Beroza, Gregory C., Waldhauser, Felix, Ellsworth, William L.

“…By measuring relative earthquake arrival times using waveform cross correlation and locating earthquakes using the double difference technique, we are able to…”
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Improvements to detection capability by cross-correlating for similar events: a case study of the 1999 Xiuyan, China, sequence and synthetic sensitivity tests by Schaff, David

“…Comparisons are made of the performance of a correlation detector compared to a standard short-term average window/long-term average window (STA/LTA) detector…”
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Improvements in magnitude precision, using the statistics of relative amplitudes measured by cross correlation by Schaff, David P., Richards, Paul G.

“…Standard processing of seismic events for reporting in bulletins is usually done one-at-a time. State-of-the-art relative event methods, often involving cross…”
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Postseismic response of repeating aftershocks by Schaff, David P., Beroza, Gregory C., Shaw, Bruce E.

“…The recurrence intervals of repeating earthquakes on the San Andreas Fault in the Loma Prieta aftershock zone follow the characteristic 1/t decay of Omori's…”
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Considering the third dimension in stress-triggering of aftershocks: 1993 Klamath Falls, Oregon, Earthquake Sequence by Crider, Juliet G., Schaff, David P., Pollard, David D., Beroza, Gregory C.

“…Dip slip on a fault of finite dimension produces a static stress change that varies considerably in 3‐D. The 1993 Klamath Falls (Oregon, USA) earthquake…”
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The applicability of modern methods of earthquake location by RICHARDS, Paul G, WALDHAUSER, Felix, SCHAFF, David, KIM, Won-Young

“…We compare traditional methods of seismic event location, based on phase pick data and analysis of events one-at-a-time, with a modern method based on…”
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