Publications
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Southern San Andreas Fault evaluation field activity: approaches to measuring small geomorphic offsets--challenges and recommendations for active fault studies Southern San Andreas Fault evaluation field activity: approaches to measuring small geomorphic offsets--challenges and recommendations for active fault studies
In southern California, where fast slip rates and sparse vegetation contribute to crisp expression of faults and microtopography, field and high‐resolution topographic data (
Authors
Katherine M. Scharer, J. Barrett Salisbury, J. Ramon Arrowsmith, Thomas K. Rockwell
Hillslope-scale experiment demonstrates role of convergence during two-step saturation Hillslope-scale experiment demonstrates role of convergence during two-step saturation
Subsurface flow and storage dynamics at hillslope scale are difficult to ascertain, often in part due to a lack of sufficient high-resolution measurements and an incomplete understanding of boundary conditions, soil properties, and other environmental aspects. A continuous and extreme rainfall experiment on an artificial hillslope at Biosphere 2's Landscape Evolution Observatory (LEO)...
Authors
A. I. Gevaert, A. J. Teuling, R. Uijlenhoet, Stephen B. DeLong, T. E. Huxman, L. A. Pangle, David D. Breshears, J. Chorover, John D. Pelletier, S. R. Saleska, X. Zeng, Peter A. Troch
Laboratory constraints on models of earthquake recurrence Laboratory constraints on models of earthquake recurrence
In this study, rock friction ‘stick-slip’ experiments are used to develop constraints on models of earthquake recurrence. Constant-rate loading of bare rock surfaces in high quality experiments produces stick-slip recurrence that is periodic at least to second order. When the loading rate is varied, recurrence is approximately inversely proportional to loading rate. These laboratory...
Authors
Nicholas M. Beeler, Terry Tullis, Jenni Junger, Brian D. Kilgore, David L. Goldsby
Elders recall an earlier tsunami on Indian Ocean shores Elders recall an earlier tsunami on Indian Ocean shores
Ten years on, the Indian Ocean tsunami of 26 December 2004 still looms large in efforts to reduce coastal risk. The disaster has spurred worldwide advances in tsunami detection and warning, tsunami-risk assessment, and tsunami awareness [Satake, 2014]. Nearly a lifetime has passed since the northwestern Indian Ocean last produced a devastating tsunami. Documentation of this tsunami, in...
Authors
Din Mohammad Kakar, Ghazala Naeem, Abdullah Usman, Haider Hasan, Hira Lohdi, Seshachalam Srinivasalu, Vanessa Andrade, C.P. Rajendran, Abdolmajid Naderi Beni, Mohammad Ali Hamzeh, Goesta Hoffmann, Noora Al Balushi, Nora Gale, Ardito Kodijat, Hermann M. Fritz, Brian F. Atwater
Key recovery factors for the August 24, 2014, South Napa Earthquake Key recovery factors for the August 24, 2014, South Napa Earthquake
Through discussions between the Federal Emergency Management Agency (FEMA) and the U.S. Geological Survey (USGS) following the South Napa earthquake, it was determined that several key decision points would be faced by FEMA for which additional information should be sought and provided by USGS and its partners. This report addresses the four tasks that were agreed to. These tasks are (1)
Authors
Kenneth W. Hudnut, Thomas M. Brocher, Carol S. Prentice, John Boatwright, Benjamin A. Brooks, Brad T. Aagaard, J. Luke Blair, Jon Peter B. Fletcher, Jemile Erdem, Charles W. Wicks, Jessica R. Murray, Fred F. Pollitz, John O. Langbein, Jerry L. Svarc, David P. Schwartz, Daniel J. Ponti, Suzanne Hecker, Stephen B. DeLong, Carla M. Rosa, Brenda Jones, Rynn M. Lamb, Anne M. Rosinski, Timothy P. McCrink, Timothy E. Dawson, Gordon G. Seitz, Craig Glennie, Darren Hauser, Todd Ericksen, Dan Mardock, Don F. Hoirup, Jonathan D. Bray, Ron S. Rubin
Structure and seismic hazard of the Ventura Avenue anticline and Ventura fault, California: Prospect for large, multisegment ruptures in the Western Transverse Ranges Structure and seismic hazard of the Ventura Avenue anticline and Ventura fault, California: Prospect for large, multisegment ruptures in the Western Transverse Ranges
The Ventura Avenue anticline is one of the fastest uplifting structures in southern California, rising at ∼5 mm/yr. We use well data and seismic reflection profiles to show that the anticline is underlain by the Ventura fault, which extends to seismogenic depth. Fault offset increases with depth, implying that the Ventura Avenue anticline is a fault‐propagation fold. A decrease in the...
Authors
Judith Hubbard, John H. Shaw, James F. Dolan, Thomas L. Pratt, Lee J. McAuliffe, Thomas K. Rockwell
CyberShake-derived ground-motion prediction models for the Los Angeles region with application to earthquake early warning CyberShake-derived ground-motion prediction models for the Los Angeles region with application to earthquake early warning
Real-time applications such as earthquake early warning (EEW) typically use empirical ground-motion prediction equations (GMPEs) along with event magnitude and source-to-site distances to estimate expected shaking levels. In this simplified approach, effects due to finite-fault geometry, directivity and site and basin response are often generalized, which may lead to a significant under-...
Authors
Maren Bose, Robert Graves, David Gill, Scott Callaghan, Phillip J. Maechling
A method and example of seismically imaging near‐surface fault zones in geologically complex areas using Vp, Vs, and their ratios A method and example of seismically imaging near‐surface fault zones in geologically complex areas using Vp, Vs, and their ratios
The determination of near‐surface (vadose zone and slightly below) fault locations and geometries is important because assessment of ground rupture, strong shaking, geologic slip rates, and rupture histories occurs at shallow depths. However, seismic imaging of fault zones at shallow depths can be difficult due to near‐surface complexities, such as weathering, groundwater saturation...
Authors
Rufus D. Catchings, Michael J. Rymer, Mark R. Goldman, Robert R. Sickler, Coyn J. Criley
The 17 May 2012 M4.8 earthquake near Timpson, East Texas: An event possibly triggered by fluid injection The 17 May 2012 M4.8 earthquake near Timpson, East Texas: An event possibly triggered by fluid injection
This study summarizes our investigation of the 17 May 2012 MW-RMT4.8 earthquake near Timpson, Texas, the largest earthquake recorded historically in eastern Texas. To identify preshocks and aftershocks of the 17 May event we examined the arrivals recorded at Nacogdoches (NATX) 30 km from the 17 May epicenter, at nearby USArray Transportable Array stations, and at eight temporary stations...
Authors
Cliff Frohlich, William L. Ellsworth, Wesley Brown, Michael Brunt, James Luetgert, Tim G. MacDonald, Steven Walters
Probing reservoir-triggered earthquakes in Koyna, India, through scientific deep drilling Probing reservoir-triggered earthquakes in Koyna, India, through scientific deep drilling
We report here the salient features of the recently concluded International Continental Scientific Drilling Program (ICDP) workshop in Koyna, India. This workshop was a sequel to the earlier held ICDP workshop in Hyderabad and Koyna in 2011. A total of 49 experts (37 from India and 12 from 8 other countries) spent 3 days reviewing the work carried out during the last 3 years based on the
Authors
H. Gupta, Shailesh Nayak, William L. Ellsworth, Y. J. B. Rao, S. Rajan, B.K. Bansal, N. Purnachandra Rao, S. Roy, K. Arora, R. Mohan, V. M. Tiwari, H. V. S. Satyanarayana, P. K. Patro, D. Shashidhar, K. Mallika
Rocking behavior of an instrumented unique building on the MIT campus identified from ambient shaking data Rocking behavior of an instrumented unique building on the MIT campus identified from ambient shaking data
A state-of-the-art seismic monitoring system comprising 36 accelerometers and a data-logger with real-time capability was recently installed at Building 54 on the Massachusetts Institute of Technology's (MIT) Cambridge, MA, campus. The system is designed to record translational, torsional, and rocking motions, and to facilitate the computation of drift between select pairs of floors. The...
Authors
Mehmet Çelebi, Nafi Toksoz, Oral Buyukozturk
Advantages of active love wave techniques in geophysical characterizations of seismographic station - Case studies in California and the central and eastern United States Advantages of active love wave techniques in geophysical characterizations of seismographic station - Case studies in California and the central and eastern United States
Active-source Love waves, recorded by the multi-channel analysis of surface wave (MASLW) technique, were recently analyzed in two site characterization projects. Between 2010 and 2012, the 2009 American Recovery and Reinvestment Act (ARRA) funded GEOVision to conduct geophysical investigations at 191 seismographic stations in California and the Central Eastern U.S. (CEUS). The original...
Authors
Antony Martin, Alan K. Yong, Larry A. Salomone