Regional phase excitation and propagation in the Lop Nor region of central Asia and implications for <i>P/Lg</i> discriminants

Xie, Jiakang; Patton, Howard J.

doi:10.1029/1998jb900045

Cited by 48 publications

(65 citation statements)

References 43 publications

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“…Some of these complexities may have comparable or larger effects on P n and S n geometric spreading than the Earth's sphericity does in some regions of the world. For example, Xie and Patton (1999) attribute the large P n amplitude variation across a small-aperture seismic array in central Asia to the varying Moho depth in the region. Zhao (1993) obtain a mantle-lid P-wave velocity gradient of 8:0 × 10 4 sec 1 for the Basin and Range province in the United States.…”

Section: Discussionmentioning

confidence: 99%

“…We use a simplified version of the scaling factor K expressed as Kf f4πρv 3 1 f=f c 2 g 1 using crustal P-wave velocity and the density of the reference Earth model as v and ρ. The source corner frequency f c is calculated from the source moment using the relationship log M 0 17:08 3:24 log f c derived by Xie and Patton (1999) from P n amplitude data recorded in central Asia. For comparison, we use both the new P n geometric-spreading model and the powerlaw model with two different exponents, 1:1 and 1:3, in the attenuation estimation.…”

Section: Application To Observed Datamentioning

confidence: 99%

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Geometric Spreading of Pn and Sn in a Spherical Earth Model

Yang¹,

Lay²,

Xie³

et al. 2007

Bulletin of the Seismological Society of America

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Geometric spreading of P n and S n waves in a spherical Earth model is different than that of classical headwaves and is frequency dependent. The behavior cannot be fully represented by a frequency-independent power-law model, as is commonly assumed. The lack of an accurate representation of P n and S n geometric spreading in a spherical Earth model impedes our ability to characterize Earth properties including anelasticity. We conduct numerical simulations to quantify P n and S n geometric spreading in a spherical Earth model with constant mantle-lid velocities. Based on our simulation results, we present new empirical P n and S n geometricspreading models in the form Gr; f 10 n 3 f =r 0 r 0 =r n 1 f logr 0 =rn 2 f and n i f n i1 logf=f 0 2 n i2 logf=f 0 n i3 , where i 1, 2, or 3; r is epicentral distance; f is frequency; r 0 1 km; and f 0 1 Hz. We derive values of coefficients n ij by fitting the model to computed P n and S n amplitudes for a spherical Earth model having a 40-km-thick crust, generic values of P and S velocities, and a constant-velocity uppermost mantle. We apply the new spreading model to observed data in Eurasia to estimate average P n attenuation, obtaining more reasonable results compared to using a standard power-law model. Our new P n and S n geometric-spreading models provide generally applicable reference behavior for spherical Earth models with constant uppermost-mantle velocities.

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Section: Discussionmentioning

confidence: 99%

Section: Application To Observed Datamentioning

confidence: 99%

Geometric Spreading of Pn and Sn in a Spherical Earth Model

Yang¹,

Lay²,

Xie³

et al. 2007

Bulletin of the Seismological Society of America

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“…In fact, this kind of scaling relation has been suggested by several investigators (e.g., Xie and Patton, 1999;Izutani and Kanamori, 2001). We now investigate the consequence of this scaling relation and its implications.…”

Section: Moment-to-corner-frequency Scaling Relationmentioning

confidence: 99%

Static and Dynamic Scaling Relations for Earthquakes and Their Implications for Rupture Speed and Stress Drop

Kanamori¹

2004

Bulletin of the Seismological Society of America

193

161

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We investigate the relation between a static scaling relation, M 0 (seismic moment) versus f 0 (spectral corner frequency), and a dynamic scaling relation between M 0 and E R (radiated energy). These two scaling relations are not independent. Using the variational calculus, we show that the ratio ẽ ‫ס‬ E R /M 0 has a lower bound, w 10 able data on these scaling relations. We note that the scaling relation, Dr s V 3 ϰ , suggests that even if ẽ is scale independent and M 0 ϰ (i.e., e ‫ס‬ 0),

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“…They did not offer any physical explanation for these observations. Xie and Patton [9] used a more formal inversion algorithm to separate source effects from propagation for the Pn and Lg phases from Lop Nor explosions and nearby earthquakes. They concluded that "spectral overshoot for explosions, differences in corner frequencies for Pn and Lg waves, and scaling relation for key spectral parameters are significant factors controlling the performance of the P/Lg discriminants for small to moderate events in central Asia."…”

Section: Introductionmentioning

confidence: 99%

Generation of High-Frequency P and S Wave Radiation from Underground Explosions

Sammis¹

2011

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. (From -To) REPORT DATE (DD-MM-YYYY) 30-12-2011 REPORT TYPE Final Report DATES COVERED SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES)Air Force Research Laboratory Space Vehicles Directorate 3550 Aberdeen Ave SE Kirtland AFB, NM 87117-5776 SPONSOR/MONITOR'S ACRONYM(S)AFRL/RVBYE SPONSOR/MONITOR'S REPORT NUMBER(S) AFRL-RV-PS-TR-2012-0035 DISTRIBUTION / AVAILABILITY STATEMENTApproved for public release; distribution is unlimited. (377ABW-2012-0113 dtd 01 Feb 2012) SUPPLEMENTARY NOTES ABSTRACTThe quasistatic damage mechanics formulated by Ashby and Sammis has been made fully dynamic by incorporating the results of recent experimental and theoretical studies of dynamic crack growth. The model has been verified by building it into the ABAQUS dynamic finite element code and using it to simulate high-speed fracture experiments. Simulation of explosions has shown that the spatial extent and pattern of the resultant fracture damage is sensitive to loading rate. High loading rates of short duration produce spherically symmetric compact damage patterns. Slower loading rates of longer duration are more effective in producing long radial fractures. Any asymmetry in the pattern of such radial fractures generates S wave radiation in the far-field, even in the absence of other factors known to generate S waves such as tectonic shear stress or anisotropy in the initial fracture distribution. SUBJECT TERMSShear waves, Seismic sources, Model seismology, P and S wave radiation SECURITY CLASSIFICATION OF:Fill in according to classification of report.

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Regional phase excitation and propagation in the Lop Nor region of central Asia and implications for P/Lg discriminants

Cited by 48 publications

References 43 publications

Geometric Spreading of Pn and Sn in a Spherical Earth Model

Geometric Spreading of Pn and Sn in a Spherical Earth Model

Static and Dynamic Scaling Relations for Earthquakes and Their Implications for Rupture Speed and Stress Drop

Generation of High-Frequency P and S Wave Radiation from Underground Explosions

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