Simulated annealing inversion of teleseismic <i>P</i>‐wave slowness and azimuth for crustal velocity structure at Long Valley Caldera

Steck, Lee K.

doi:10.1029/94gl03050

Cited by 13 publications

(8 citation statements)

References 18 publications

(10 reference statements)

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“…The impressive results stimulated many applications to other geophysical optimization problems. These include the estimation of Earth models from fitting of seismic body waveforms in exploration seismics reflection seismics and migration [ Jakobsen et al ., 1988; Jervis et al ., 1993; Varela et al ., 1998; Landa et al ., 1989; Mosegaard and Vestergaard , 1991; Vestergaard and Mosegaard , 1991; Sen and Stoffa , 1991]; inversion of travel/arrival time data [ Pullammanappallil and Louie , 1993, 1994]; earthquake location and rupture histories [ Billings , 1994; Hartzell and Liu , 1996]; seismic source and ground motion studies [ Scherbaum et al ., 1994; Courboulex et al ., 1996; Ihmle and Ruegg , 1997]; estimation of crustal structure [ Steck , 1995; Zhao et al ., 1996]; deconvolution of seismograms [ Courboulex et al ., 1996; Calderon et al ., 1997]; thermodynamic modeling [ Bina , 1998]; groundwater management and remediation [ Dougherty and Marryott , 1991; Kou et al ., 1992; Rizzo and Dougherty , 1996; Rogers et al ., 1998]; more residual statics estimation [ Vasudevan and Wilson , 1991; Nørmark and Mosegaard , 1993]; waste disposal site selection [ Muttiah et al ., 1996]; geostatistics [ Datta et al ., 1995; Goovaerts , 1996; Pardo , 1998]; seismic ray tracing [ Velis and Ulrych , 1996]; and electromagnetic, resistivity, and magnetotelluric imaging [ Gilbert and Virieux , 1991; Dosso and Oldenburg , 1991; Dittmer and Szymanski , 1995]. This is only a subset of the many papers making use of this technique over the past 10 years.…”

Section: A Brief History Of Monte Carlo Inversion In Geophysicsmentioning

confidence: 99%

Monte Carlo Methods in Geophysical Inverse Problems

Sambridge

Mosegaard

2002

Reviews of Geophysics

651

395

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[1] Monte Carlo inversion techniques were first used by Earth scientists more than 30 years ago. Since that time they have been applied to a wide range of problems, from the inversion of free oscillation data for whole Earth seismic structure to studies at the meter-scale lengths encountered in exploration seismology. This paper traces the development and application of Monte Carlo methods for inverse problems in the Earth sciences and in particular geophysics. The major developments in theory and application are traced from the earliest work of the Russian school and the pioneering studies in the west by Press [1968] to modern importance sampling and ensemble inference methods. The paper is divided into two parts. The first is a literature review, and the second is a summary of Monte Carlo techniques that are currently popular in geophysics. These include simulated annealing, genetic algorithms, and other importance sampling approaches. The objective is to act as both an introduction for newcomers to the field and a comprehensive reference source for researchers already familiar with Monte Carlo inversion. It is our hope that the paper will serve as a timely summary of an expanding and versatile methodology and also encourage applications to new areas of the Earth sciences. INDEX TERMS:3260

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Section: A Brief History Of Monte Carlo Inversion In Geophysicsmentioning

confidence: 99%

Monte Carlo Methods in Geophysical Inverse Problems

Sambridge

Mosegaard

2002

Reviews of Geophysics

651

395

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“…The source of previous inflation episodes has been suggested to be a combination of partially molten magma and hydrous fluids [ Hill , 2006], and there is no evidence to suggest this episode is different. The existence of partial melt at shallow depths in the LVC is supported by the volcanic history of LVC [ Bailey et al , 1976; Bailey , 1989], the seismic refraction data [ Hill , 1976; Hill et al , 1985], the tomographic inversions [ Dawson et al , 1990; Steck , 1995; Sanders et al , 1995; Weiland et al , 1995], and strongly suggested by changes in gravity associated with the 1997–1998 episode [ Battaglia et al , 1999].…”

Section: Analytical Modelsmentioning

confidence: 99%

Constraints on continued episodic inflation at Long Valley Caldera, based on seismic and geodetic observations

Feng¹,

Newman²

2009

J. Geophys. Res.

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Long Valley Caldera, a large and potentially explosive silicic system, has experienced highly anomalous continued inflation since late 1970s. We characterize an episode of rapid episodic uplift occurring between 2002 and 2003 following similar episodes of 1979–1980, 1983, 1989–1990, and 1997–1998. This most recent episode was the first to be observed by a dense array of 13 continuous Global Positioning System (GPS) stations. Similar to previously observed episodes of deformation, uplift is quasi‐radially symmetric and is mostly explained by a compact pressure source located ∼3 km west of the resurgent dome. The maximum uplift during the 2002–2003 episode is ∼35 ± 8 mm, about 1/3 the magnitude but with a similar time‐dependent behavior as the 1997–1998 episode. The horizontal source location is well constrained at −118.930°, 37.678°, for a small spherical source, and indistinguishable from the location of a vertically dipping prolate spheroidal source. A trade‐off between depth and volume change is observed for both spherical and prolate models, with depth between 7.5 and 13.5 km and a volume change of 0.01–0.03 km3 at 95% confidence. For prolate spheroidal models, depth and volume change are additionally affected by the source axis ratio (b/a), which is greater than 0.55. Though the background seismicity remained low during the 2002–2003 episode, we identified a significant spike in activity during the maximum rate of uplift, similar to observations in both the much larger episodes in 1989–1990, and 1997–1998. More interestingly, we additionally find that all three episodes begin immediately after a short period of seismic quiescence, with background seismicity falling to levels below background levels following the prior uplift event. With the dense GPS coverage, we also identify increased opening of the Mono‐Inyo volcanic chain after the 2002–2003 episode suggesting potential interaction of magmatic fluids between the two systems.

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“…Recently, genetic algorithms have been used to conduct inversions (Ammon & Vidale 1993; Steck 1995). They are non‐linear global search algorithms, which draw on similarities between combinatorial optimization and the statistical mechanics of crystallization.…”

Section: Advances Of Seismic Tomographymentioning

confidence: 99%

“…Seismic wave polarizations can be measured either with an array of stations or with a single 3‐component station. Recently, a few researchers have combined teleseismic polarization data with arrival times to conduct tomographic inversions and obtained promising results (Steck 1995; Hu et al 1994). The polarization inversion is not influenced by hypocentral errors and not sensitive to deep mantle velocity structure.…”

Section: Advances Of Seismic Tomographymentioning

confidence: 99%

New advances of seismic tomography and its applications to subduction zones and earthquake fault zones: A review

Zhao¹

2001

Island Arc

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There have been significant advances in the theory and applications of seismic tomography in the last decade. These include the refinements in the model parameterization, 3‐D ray tracing, inversion algorithm, resolution and error analyses, joint use of local, regional and teleseismic data, and the addition of converted and reflected waves in the tomographic inversion. Applications of the new generation tomographic methods to subduction zones have resulted in unprecedentedly clear images of the subducting oceanic lithosphere and magma chambers in the mantle wedge beneath active arc volcanoes, indicating that geodynamic systems associated with the arc magmatism and back‐arc spreading are related to deep processes, such as the convective circulation in the mantle wedge and deep dehydration reactions in the subducting slab. High‐resolution tomographic imagings of earthquake fault zones in Japan and California show that rupture nucleation and earthquake generating processes are closely related to the heterogeneities of crustal materials and inelastic processes in the fault zones, such as the migration of fluids. Evidence also shows that arc magmatism and slab dehydration may also contribute to the generation of large crustal earthquakes in subduction regions.

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Simulated annealing inversion of teleseismic P‐wave slowness and azimuth for crustal velocity structure at Long Valley Caldera

Cited by 13 publications

References 18 publications

Monte Carlo Methods in Geophysical Inverse Problems

Monte Carlo Methods in Geophysical Inverse Problems

Constraints on continued episodic inflation at Long Valley Caldera, based on seismic and geodetic observations

New advances of seismic tomography and its applications to subduction zones and earthquake fault zones: A review

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