Publications
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Absence of remotely triggered large earthquakes beyond the mainshock region
Large earthquakes are known to trigger earthquakes elsewhere. Damaging large aftershocks occur close to the mainshock and microearthquakes are triggered by passing seismic waves at significant distances from the mainshock. It is unclear, however, whether bigger, more damaging earthquakes are routinely triggered at distances far from the mainshock, heightening the global seismic hazard after every
Authors
T. Parsons, A.A. Velasco
Modifications to existing ground-motion prediction equations in light of new data
We compare our recent ground-motion prediction equations (GMPEs) for western North America (WNA; Boore and Atkinson, 2008 [BA08]) and eastern North America (ENA; Atkinson and Boore, 2006 [AB06]; Atkinson, 2008 [A08]) to newly available ground-motion data. Based on these comparisons, we suggest revisions to our GMPEs for both WNA and ENA. The revisions for WNA affect only those events with M ≤ 5:75
Authors
G. M. Atkinson, D. M. Boore
The ShakeOut earthquake source and ground motion simulations
The ShakeOut Scenario is premised upon the detailed description of a hypothetical Mw 7.8 earthquake on the southern San Andreas Fault and the associated simulated ground motions. The main features of the scenario, such as its endpoints, magnitude, and gross slip distribution, were defined through expert opinion and incorporated information from many previous studies. Slip at smaller length scales,
Authors
R.W. Graves, Douglas B. Houston, K.W. Hudnut
The 16 May 1909 northern Great Plains earthquake
The largest historical earthquake in the northern Great Plains occurred on 16 May 1909. Our analysis of intensity assignments places the earthquake location (48.81° N, 105.38° W) close to the Montana–Saskatchewan border with an intensity magnitude MI of 5.3–5.4. Observations from two seismic observatories in Europe give an average Ms value of 5.3. The 1909 earthquake is near an alignment of epicen
Authors
W. H. Bakun, M. C. Stickney, Gary C. Rogers
Soil-geomorphic significance of land surface characteristics in an arid mountain range, Mojave Desert, USA
Mountains comprise an extensive and visually prominent portion of the landscape in the Mojave Desert, California. Landform surface properties influence the role these mountains have in geomorphic processes such as dust flux and surface hydrology across the region. The primary goal of this study was to describe and quantify land surface properties of arid-mountain landforms as a step toward unravel
Authors
D.R. Hirmas, R.C. Graham, K.J. Kendrick
Coulomb stress change sensitivity due to variability in mainshock source models and receiving fault parameters: A case study of the 2010-2011 Christchurch, New Zealand, earthquakes
Strong aftershocks following major earthquakes present significant challenges for infrastructure recovery as well as for emergency rescue efforts. A tragic instance of this is the 22 February 2011 Mw 6.3 Christchurch aftershock in New Zealand, which caused more than 100 deaths while the 2010 Mw 7.1 Canterbury mainshock did not cause a single fatality (Figure 1). Therefore, substantial efforts have
Authors
Zhongwen Zhan, Bikai Jin, Shengji Wei, Robert W. Graves
Deep rock damage in the san andreas fault revealed by P- and S-type fault-zone-guided waves
Damage to fault-zone rocks during fault slip results in the formation of a channel of low seismic-wave velocities. Within such channels guided seismic waves, denoted by Fg, can propagate. Here we show with core samples, well logs and Fg-waves that such a channel is crossed by the SAFOD (San Andreas Fault Observatory at Depth) borehole at a depth of 2.7 km near Parkfield, California, USA. This late
Authors
William L. Ellsworth, Peter E. Malin
Inversion of ground-motion data from a seismometer array for rotation using a modification of Jaeger's method
We develop a new way to invert 2D translational waveforms using Jaeger's (1969) formula to derive rotational ground motions about one axis and estimate the errors in them using techniques from statistical multivariate analysis. This procedure can be used to derive rotational ground motions and strains using arrayed translational data, thus providing an efficient way to calibrate the performance of
Authors
Wu-Cheng Chi, W.H.K. Lee, J.A.D. Aston, C.J. Lin, C.-C. Liu
High-frequency filtering of strong-motion records
The influence of noise in strong-motion records is most problematic at low and high frequencies where the signal to noise ratio is commonly low compared to that in the mid-spectrum. The impact of low-frequency noise (5 Hz) on computed pseudo-absolute response spectral accelerations (PSAs). In contrast to the case of low-frequency noise our analysis shows that filtering to remove high-frequency noi
Authors
J. Douglas, D. M. Boore
Economic impacts of the ShakeOut scenario
For the ShakeOut Earthquake Scenario, we estimate $68 billion in direct and indirect business interruption (BI) and $11 billion in related costs in addition to the $113 billion in property damage in an eight-county Southern California region. The modeled conduits of shock to the economy are property damage and lifeline service outages that affect the economy’s ability to produce. Property damage f
Authors
A. Rose, D. Wei, A. Wein
8 March 2010 Elazığ-Kovancilar (Turkey) Earthquake: observations on ground motions and building damage
An earthquake of MW = 6.1 occurred in the Elazığ region of eastern Turkey on 8 March 2010 at 02:32:34 UTC. The United States Geological Survey (USGS) reported the epicenter of the earthquake as 38.873°N-39.981°E with a focal depth of 12 km. Forty-two people lost their lives and 137 were injured during the event. The earthquake was reported to be on the left-lateral strike-slip east Anatolian fault
Authors
Sinan Akkar, A. Aldemir, A. Askan, S. Bakir, E. Canbay, I.O. Demirel, M.A. Erberik, Z. Gulerce, Polat Gülkan, Erol Kalkan, S. Prakash, M.A. Sandikkaya, V. Sevilgen, B. Ugurhan, E. Yenier
Real-time seismic monitoring of structures: Data handling and case studies
Within the last decade, advances in the acquisition, processing and transmission of data from real-time seismic monitoring systems has contributed to the growth in the number structures instrumented with such systems. An equally important factor for such growth can be attributed to the demands by stakeholders to find rapid answers to important questions related to the functionality (or “state of h
Authors
Mehmet Çelebi