Publications
Filter Total Items: 1858
Revelations from ambient shaking data of a recently instrumented unique building at MIT campus
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 campus of the Massachusetts Institute of Technology [MIT], Cambridge, Massachusetts. The system is designed to record translational, torsional and rocking motions, and to facilitate computation of drift between select pairs of stories. T
Authors
Mehmet Çelebi, N. Toksoz, O. Buyukozturk
Summary of November 2010 meeting to evaluate turbidite data for constraining the recurrence parameters of great Cascadia earthquakes for the update of national seismic hazard maps
This report summarizes a meeting of geologists, marine sedimentologists, geophysicists, and seismologists that was held on November 18–19, 2010 at Oregon State University in Corvallis, Oregon. The overall goal of the meeting was to evaluate observations of turbidite deposits to provide constraints on the recurrence time and rupture extent of great Cascadia subduction zone (CSZ) earthquakes for the
Authors
Arthur D. Frankel
Cone penetration tests and soil borings at the Mason Road site in Green Valley, Solano County, California
In support of a study to investigate the history of the Green Valley Fault, 13 cone penetration test soundings and 3 auger borings were made at the Mason Road site in Green Valley, Solano County, California. Three borings were made at or near two of the cone penetration test soundings. The soils are mostly clayey with a few sandy layers or lenses. Fine-grained soils range from low plasticity sandy
Authors
Michael J. Bennett, Thomas E. Noce, James J. Lienkaemper
Active mountain building and the distribution of core Maxillariinae species in tropical Mexico and Central America
The observation that southeastern Central America is a hotspot for orchid diversity has long been known and confirmed by recent systematic studies and checklists. An analysis of the geographic and elevation distribution demonstrates that the most widespread species of “core” Maxillariinae are all adapted to life near sea level, whereas the most narrowly endemic species are largely distributed in w
Authors
Stephen H. Kirby
The role of adsorbed water on the friction of a layer of submicron particles
Anomalously low values of friction observed in layers of submicron particles deformed in simple shear at high slip velocities are explained as the consequence of a one nanometer thick layer of water adsorbed on the particles. The observed transition from normal friction with an apparent coefficient near μ = 0.6 at low slip speeds to a coefficient near μ = 0.3 at higher slip speeds is attributed to
Authors
Charles G. Sammis, David A. Lockner, Ze’ev Reches
High-frequency Born synthetic seismograms based on coupled normal modes
High-frequency and full waveform synthetic seismograms on a 3-D laterally heterogeneous earth model are simulated using the theory of coupled normal modes. The set of coupled integral equations that describe the 3-D response are simplified into a set of uncoupled integral equations by using the Born approximation to calculate scattered wavefields and the pure-path approximation to modulate the pha
Authors
Fred F. Pollitz
Preface to the Focused Issue on the 22 February 2011 Magnitude 6.2 Christchurch Earthquake
The 22 February 2011 magnitude 6.2 Christchurch earthquake, centered southeast of Christchurch, was part of the aftershock sequence that has been occurring since the September 2010 magnitude 7.1 quake near Darfield, 40 km west of the city. The Christchurch earthquake killed more than 180 people, damaged or destroyed more than 100,000 buildings, and is New Zealand's most deadly disaster since the e
Authors
Erol Kalkan
The role of dyking and fault control in the rapid onset of eruption at Chaitén Volcano, Chile
Rhyolite is the most viscous of liquid magmas, so it was surprising that on 2 May 2008 at Chaitén Volcano, located in Chile’s southern Andean volcanic zone, rhyolitic magma migrated from more than 5 km depth in less than 4 hours and erupted explosively with only two days of detected precursory seismic activity. The last major rhyolite eruption before that at Chaitén was the largest volcanic erupti
Authors
Charles W. Wicks, J. Carlos de la Llera, Luis E. Lara, Jacob B. Lowenstern
Coulomb 3.3 Graphic-rich deformation and stress-change software for earthquake, tectonic, and volcano research and teaching-user guide
Coulomb is intended both for publication-directed research and for college and graduate school classroom instruction. We believe that one learns best when one can see the most and can explore alternatives quickly. So the principal feature of Coulomb is ease of input, rapid interactive modification, and intuitive visualization of the results. The program has menus and check-items, and dialogue boxe
Authors
Shingi Toda, Ross S. Stein, Volkan Sevilgen, Jian Lin
Site characterization and site response in Port-au-Prince, Haiti
Waveform analysis of aftershocks of the Mw7.0 Haiti earthquake of 12 January 2010 reveals amplification of ground motions at sites within the Cul de Sac valley in which Port-au-Prince is situated. Relative to ground motions recorded at a hard-rock reference site, peak acceleration values are amplified by a factor of approximately 1.8 at sites on low-lying Mio-Pliocene deposits in central Port-au-P
Authors
Susan E. Hough, Alan K. Yong, Jean Robert Altidor, Dieuseul Anglade, Douglas D. Given, Saint-Louis Mildor
Moment tensor inversions using strong motion waveforms of Taiwan TSMIP data, 1993–2009
Earthquake source parameters are important for earthquake studies and seismic hazard assessment. Moment tensors are among the most important earthquake source parameters, and are now routinely derived using modern broadband seismic networks around the world. Similar waveform inversion techniques can also apply to other available data, including strong-motion seismograms. Strong-motion waveforms ar
Authors
Kaiwen Chang, Wu-Cheng Chi, Yuancheng Gung, Douglas Dreger, William H. K. Lee, Hung-Chie Chiu