Analysis of deformation data at Parkfield, California: Detection of a long‐term strain transient

Gao, Stephen S.; Silver, Paul G.; Linde, A. T.

doi:10.1029/1999jb900383

Cited by 39 publications

(36 citation statements)

References 18 publications

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“…The speed-up of fault slip over the 1993 to 1995 interval suggested by Gwyther et ale (1996), Langbein et al (1999), Nadeau and McEvilly (1999), and Gao et al (2000), as well as the occurrence of three M > 4 earthquakes from late 1992 to late 1994, perturbed the stresses under Middle Mountain (Fletcher and Guatteri, 1998;Fletcher and Spudich, 1999 temporal-resolution displacement data are available through the mainshock and the subsequent rapid slip following the earthquake. For instance, the data for XMM1 in Figure 12 are from the low-sensitivity sensor because the high-sensitivity sensor was off-scale for part of the period.…”

Section: Discussionmentioning

confidence: 95%

Preliminary Report on the 28 September 2004, M 6.0 Parkfield, California Earthquake

Langbein¹,

Borcherdt²,

Dreger³

et al. 2005

Seismological Research Letters

133

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Section: Discussionmentioning

confidence: 95%

Preliminary Report on the 28 September 2004, M 6.0 Parkfield, California Earthquake

Langbein¹,

Borcherdt²,

Dreger³

et al. 2005

Seismological Research Letters

133

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“…The acceleration of the slip rate observed by Gao et al (2000) overlaps almost completely with the constant decay rate of the λ b value (Fig. 9b and Table 2).…”

Section: Central Californiamentioning

confidence: 75%

“…The standard deviation associated with the slow down of slip rates makes the observation much more controversial than the subsequent increase. Langbein et al (1999) and Gao et al (2000) note that this increase of slip rate occurs just after a sequence of 3<M<5 earthquakes in the vicinity of Middle Mountain, but last for few years afterward.…”

Section: Central Californiamentioning

confidence: 99%

“…From the analysis of more than a decade of high quality data, particularly those from the two-color electronic distance meter in the Parkfield area, Gao et al (2000) suggest that the SAF underwent two transient phases of slip summarized in Table 2: a transient decrease in slip rate of about 1.5 mm/yr between 1991 and 1993; a transient increase in slip rate of about 3.3 mm/yr between 1993 and 1998. The standard deviation associated with the slow down of slip rates makes the observation much more controversial than the subsequent increase.…”

Section: Central Californiamentioning

confidence: 99%

“…Temporally, Murray and Segall (2005) Table 2. Results of the inversion of Gao et al (2000) from the examination of the Parkfield deformation dataset, particularly those from the two color electronic distance meter. V 0 is an apparent velocity estimate and V 1,2 =V 0 −V 1,2 are transient velocities.…”

Section: Central Californiamentioning

confidence: 99%

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Loading rates in California inferred from aftershocks

Narteau

Shebalin

Holschneider³

2008

Nonlin. Processes Geophys.

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Abstract.We estimate the loading rate in southern California and the change in stress induced by a transient slip event across the San Andreas fault (SAF) system in central California, using a model of static fatigue. We analyze temporal properties of aftershocks in order to determine the time delay before the onset of the power law aftershock decay rate. In creep-slip and stick-slip zones, we show that the rate of change of this delay is related to seismic and aseismic deformation across the SAF system. Furthermore, we show that this rate of change is proportional to the deficit of slip rate along the SAF. This new relationship between geodetic and seismological data is in good agreement with predictions from a Limited Power Law model in which the evolution of the duration of a linear aftershock decay rate over short time results from variations in the load of the brittle upper crust.

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Rock and mineral transformations in a fault zone leading to permanent creep: Interactions between brittle and viscous mechanisms in the San Andreas Fault

et al. 2014

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Creep processes may relax part of the tectonic stresses in active faults, either by continuous or episodic processes. The aim of this study is to obtain a better understanding of these creep mechanisms and the manner in which they change in time and space. Results are presented from microstructural studies of natural samples collected from San Andreas Fault Observatory at Depth borehole drilled through the San Andreas Fault, which reveal the chronology of the deformation within three domain types. (i) A relatively undeformed zone of the host rock reflects the first step of the deformation process with fracturing and grain indentations showing the coupling between fracturing and pressure solution. (ii) Shear deformation development that associates fracturing and solution cleavage processes leads to profound changes in rock composition and behavior with two types of development depending on the ratio between the amount of dissolution and deposition: abundant mineral precipitation strengthens some zones while pervasive dissolution weakens some others, (iii) zones with mainly dissolution trended toward the present-day creeping zones thanks to both the passive concentration of phyllosilicates and their metamorphic transformation into soft minerals such as saponite. This study shows how interactions between brittle and viscous mechanisms lead to widespread transformation of the rocks and how a shear zone may evolve from a zone prone to earthquakes and postseismic creep to a zone of steady state creep. In parallel, the authors discuss how the creeping mechanism, mainly controlled by the very low friction of the saponite in the first 3-4 km depth, may evolve with depth.

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Analysis of deformation data at Parkfield, California: Detection of a long‐term strain transient

Abstract: Support for this northwestern slip is provided by a recent study of slip rate based on microearthquake activity. We speculate that this northwestern event served to load the fault to the southeast, with the stress being partially released by the observed slip.

Cited by 39 publications

References 18 publications

Preliminary Report on the 28 September 2004, M 6.0 Parkfield, California Earthquake

Preliminary Report on the 28 September 2004, M 6.0 Parkfield, California Earthquake

Loading rates in California inferred from aftershocks

Rock and mineral transformations in a fault zone leading to permanent creep: Interactions between brittle and viscous mechanisms in the San Andreas Fault

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