<i>Q</i> structure of the basin and range from surface waves

Patton, Howard J.; Taylor, Steven R.

doi:10.1029/jb089ib08p06929

Cited by 67 publications

(54 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These data were fit in a forward sense, that is, N30"E strike, 90" dip, and left-lateral strike slip were assumed, and the moment and rise time were adjusted to best fit the observed seismograms. The earth model used in computing the synthetic seismograms was a refinement of the Great Basin velocity model of Priestley & Brune (1978) and the Great Basin attenuation model of Patton & Taylor (1984). The results are consistent with a point source, with a seismic moment of 7 .…”

Section: Moment Tensor Inversionmentioning

confidence: 78%

The 1984 Round Valley, California Earthquake Sequence

Smith¹,

Cockerham²

1988

Geophysical Journal International

View full text Add to dashboard Cite

The 1984 November 23 ML 5.8 Round Valley earthquake is one in the.series of moderate earthquakes to have occurred in the Bishop-Mammoth Lakes, California area since 1978. This event and its aftershock sequence are particularly well recorded in that they occurred within a dense, local high frequency seismic network, and strong motion accelerograms, and regional and teleseismic digital seismograms are available for the main shock. We have derived the fault plane solution from the local and regional first motion data, inverted the teleseismic body wave data for the moment tensor solution, and fit regional surface waves for the low frequency moment. Unlike results for several of the earlier moderate events in the Bishop-Mammoth Lakes region, all results for the Round Valley main shock data sets give solutions consistent with left-lateral strike slip faulting on a near vertical N30"E striking plane. The seismic moment of the main shock from the regional surface wave analysis is 7.9 X 101'Nt m. Measurements of the seismic moment from regional surface waves and teleseismic body waves have been converted to spectral level and combined with the acceleration spectra to give a composite source spectrum for the main shock. The spectrum shows a lower corner frequency at 0.2Hz associated with the overall faulting event, and a higher comer frequency at 4.0 Hz which may be associated with the subevents composing the but at a lower slope of w -l between the low and high frequency corners as postulated in models for complex or partial stress drop events.The Round Valley main shock was followed by a widespread and prolonged aftershock sequence. Because of the dense local, high gain permanent seismograph network operated jointly by the University of Nevada-Reno and the United States Geological Survey, accurate locations and fault plane solutions could be determined for the aftershocks beginning immediately after the main shock, and the temporal and spatial growth of the aftershock sequence could be followed in detail. The Round Valley sequence is characterized by the development of two conjugate planes of aftershock activity; one, a near vertical plane striking N30"E associated with the main shock, and another which developed in the first 24 h of activity striking N40"W and dipping 55"NE. This shallow plane conforms to an extension of the Hilton Creek fault postulated by Malcome Clark, and may be the first indication of activity on this major Holocene structure since the recent period of earthquake activity began in 1978. Aftershocks defining the deeper near vertical plane tend to concentrate around the periphery of a 36-49 km2 area which appears to represent the slip surface of the main shock. Relating the seismic moment determined from regional surface waves to this slip area results in an average dislocation of 0.54-0.73 m and a stress drop of 1.5-2.3 MPa. Nearly 800 fault plane solutions for aftershocks were determined. A smaller subset which samples the aftershock zone both spatially and temporally shows that during the initial...

show abstract

Section: Moment Tensor Inversionmentioning

confidence: 78%

The 1984 Round Valley, California Earthquake Sequence

Smith¹,

Cockerham²

1988

Geophysical Journal International

View full text Add to dashboard Cite

show abstract

“…We fixed the velocity profile through the crystalline crust and mantle, but allowed the velocity profile in the basin to vary with special emphasis on the shallowest velocities (<250 m). The crustal model is based on PATTON and TAYLOR (1984), but we increased the surface velocities to be consistent with hard rock lithologies (NEHRP A classification) at the surface (Table 2). A double-couple source for the Little Skull Mountain earthquake at approximately 100 km from the basin provided the excitation.…”

Section: Two-dimensional Elastic Finite Difference Modelingmentioning

confidence: 99%

Site Response in Las Vegas Valley, Nevada from NTS Explosions and Earthquake Data

Rodgers

Tkalčić

McCallen

et al. 2006

Pure appl. geophys.

View full text Add to dashboard Cite

We report site response in Las Vegas Valley (LVV) from historical recordings of Nevada Test Site (NTS) nuclear explosions and earthquake recordings from permanent and temporary seismic stations. Our data set significantly improves the spatial coverage of LVV over previous studies, especially in the northern, deeper parts of the basin. Site response at stations in LVV was measured for frequencies in the range 0.2-5.0 Hz using Standard Spectral Ratios (SSR) and Horizontal-Vertical Spectral Ratios (HVR). For the SSR measurements we used a reference site (approximately NEHRP B ''rock'' classification) located on Frenchman Mountain outside the basin. Site response at sedimentary sites is variable in LVV with average amplifications approaching a factor of 10 at some frequencies. We observed peaks in the site response curves at frequencies clustered near 0.6, 1.2 and 2.0 Hz, with some sites showing additional lower amplitude peaks at higher frequencies. The spatial pattern of site response is strongly correlated with the reported depth to basement for frequencies between 0.2 and 3.0 Hz, although the frequency of peak amplification does not show a similar correlation. For a few sites where we have geotechnical shear velocities, the amplification shows a correlation with the average upper 30-meter shear velocities, V 30 . We performed two-dimensional finite difference simulations and reproduced the observed peak site amplifications at 0.6 and 1.2 Hz with a low velocity near-surface layer with shear velocities 600-750 m/s and a thickness of 100-200 m. These modeling results indicate that the amplitude and frequencies of site response peaks in LVV are strongly controlled by shallow velocity structure.

show abstract

“…The crustal model ASIA used in this study (Table 1) Synthetic spectra were computed using the method of Takeuchi and Saito [1972] for epicentral distances based on International Seismological Centre (ISC) locations. I accounted for effects of anelastic attenuation on spectra by assuming a strong decay rate for western United States [Patton and Taylor, 1984]. Since most paths are shorter than 1000 km, effects of anelastic attenuation are quite small for frequencies considered in this study (see Figure 7).…”

Section: Application To Central Asian Datamentioning

confidence: 99%

Bias in the centroid moment tensor for central Asian earthquakes: Evidence from regional surface wave data

Patton¹

1998

J. Geophys. Res.

Self Cite

View full text Add to dashboard Cite

Regional Moment EstimatesIn this paper, M o is estimated using spectral amplitudes of surface waves recorded at regional distances between 300 and 1300 kin. Waveform data are taken from broadband channels for a single station, WMQ. Figure 1 shows a map of the study area with contours of crustal thickness and epicenters plotted, where epicentral information may be found in paper 1. Data AnalysisIntermediate-period (5-50 s) surface waves are generally well recorded on broadband channels. Figure 2 shows plots of raw and low-pass-filtered waveforms and illustrates good signal-to-noise quality at low frequencies for one event. The presence of higher modes is also noted; other low-frequency phases, such as P,,t, can be well excited by sources in this study. Such energy poses some difficulties isolating fundamentalmode surface waves for spectral analysis, because time sepa-26,963

show abstract

Q structure of the basin and range from surface waves

Cited by 67 publications

References 34 publications

The 1984 Round Valley, California Earthquake Sequence

The 1984 Round Valley, California Earthquake Sequence

Site Response in Las Vegas Valley, Nevada from NTS Explosions and Earthquake Data

Bias in the centroid moment tensor for central Asian earthquakes: Evidence from regional surface wave data

Contact Info

Product

Resources

About