Deep low‐frequency earthquakes in tremor localize to the plate interface in multiple subduction zones

Brown, Justin R.; Beroza, Gregory C.; Ide, Satoshi; Ohta, Kazuaki; Shelly, D. R.; Schwartz, S. Y.; Rabbel, Wolfgang; Thorwart, Martin; Kao, Honn

doi:10.1029/2009gl040027

Cited by 176 publications

(242 citation statements)

References 28 publications

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“…Slip nucleated near the northern stations (PNEG, HATI), then propagated southward over a 30 day period. 52 seismic tremor episodes and a total of 232 low frequency earthquakes were detected in the area [Brown et al, 2009], and coincided with timing of the SSE (Figure 7). By inverting surface motion data for the May 2007 event, Outerbridge et al [2010] proposed a separation of slow slip into an updip northern patch and a downdip southern patch, which may be related to different properties of subducted crust beneath each patch.…”

Section: May 2007mentioning

confidence: 99%

“…[4] Several episodes of transient strain have been detected in the Nicoya Peninsula since 2000 from the analysis of several observation types, including GPS [Protti et al, 2004;Outerbridge et al, 2010], borehole pressure [Davis and Villinger, 2006;Davis et al, 2011], seismicity [Brown et al, 2009;Walter et al, 2011] and fluid flow [Brown et al, 2005;Tryon, 2009]. However, given the limited spatial and temporal coverage of sensors and data noise, it has not been possible to determine the recurrence interval for such events.…”

Section: Introductionmentioning

confidence: 99%

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Slow slip events in Costa Rica detected by continuous GPS observations, 2002–2011

Jiang

Wdowinski

Dixon

et al. 2012

Geochem Geophys Geosyst

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A network of continuously recording GPS stations has operated in the Nicoya Peninsula of northern Costa Rica since 2002. We processed all available data from this network for the period of 2002–2011 to investigate the occurrence of Slow Slip Events (SSE) on the subduction interface between the Cocos and Caribbean plates. In order to overcome signal masking by high levels of tropospheric noise, we developed a new technique that facilitates detection of transient events in the presence of noise. We identified five significant SSEs during the 2002–2011 period, with event middle times in 2003, 2005, 2007, 2009 and 2011, with an average recurrence interval of 21 ± 6 months. Time series analysis shows that transient deformation imparts a signature similar to random walk. Removal of the SSEs and regional common mode errors from the time series reduced velocity uncertainty by nearly an order of magnitude. Limited available data for the 2003, 2005 and 2011 events preclude detailed characterization of these events. However, good spatiotemporal coverage of the 2007 and 2009 events suggest that both events had irregular duration and distribution. In the 2007 event, slow slip started in the northwest coastal area and migrated southeastward over a period of ∼1 month. The 2009 event had a significantly longer event duration and larger surface displacement. Stations in the northwest area observed two separate SSEs in 2008.6 and 2009.4, correlating well with the tremor episodes offshore, indicating a shallow SSE slip patch with shorter recurrence interval. Significant differences between the 2009 and 2007 events lead us to question the simple recurrence interval model for the SSE in Nicoya.

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Section: May 2007mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Slow slip events in Costa Rica detected by continuous GPS observations, 2002–2011

Jiang

Wdowinski

Dixon

et al. 2012

Geochem Geophys Geosyst

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“…We suggest that ductile failure of ultramylonite zones may provide a viable mechanism inducing earthquakes in the lower crust [Maggi et al, 2000]. Likewise, ductile failure is a possible mechanism explaining the occurrence of intermediate and deep nonvolcanic tremors in subduction zones [Obara, 2002;Obara and Hirose, 2006;Ito and Obara, 2006;Ito et al, 2007;Brown et al, 2009] and fault zones [Nadeau and Dolenc, 2005], which are commonly assumed to be generated by dehydration reactions and/or fluid pressure pulses.…”

Section: Geological Applicationmentioning

confidence: 99%

Superplasticity and ductile fracture of synthetic feldspar deformed to large strain

Rybacki¹,

Wirth²,

Dresen³

2010

J. Geophys. Res.

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[1] We performed high-strain torsion experiments on fine-grained (≈4 mm) anorthite aggregates in a Paterson-type gas deformation apparatus. The dense hydrous (≈0.1 wt% H 2 O) samples contain < 3 vol% Si-enriched residual glass located at triple junctions. Specimens were twisted at constant rate to a maximum shear strain of about 5 at experimental conditions of 100-400 MPa confining pressure, temperatures of 950°C-1200°C, and shear strain rates of ≈2 × 10 −5 , 5 × 10 −5 , and 2 × 10 −4 s −1 . Resulting maximum shear stresses at the sample periphery were in the range of ≈2-80 MPa. The samples showed strain hardening at slow deformation rate and strain weakening at fast strain rate, respectively. Fitting the stress strain rate data to a power law yields linear viscous behavior. Microstructural analysis shows locally enhanced dislocation density, suggesting diffusion-assisted and/or dislocation-assisted grain boundary sliding as the dominant deformation mechanism. Deformed samples exhibit abundant cavities, nucleated mostly at grain triple junctions and at grain boundaries in response to cooperative grain boundary sliding. At shear strains ≥ 2, growth and coalescence of the cavities form an anastomozing network of regularly spaced strings oriented at about 30°to the direction of maximum compressive stress and ∼15°to the shear plane. Strain is localized along these shear bands associated with a shape-preferred orientation of high-aspect ratio feldspar grains and with segregation of initial pore fluids (residual glass) into the bands. More than one third of the samples were deformed to terminal failure that occurred suddenly at shear strains of ≈3-5. The experiments indicate that cavitation damage may facilitate fluid flow and deep seismicity in highly strained shear zones.Citation: Rybacki, E., R. Wirth, and G. Dresen (2010), Superplasticity and ductile fracture of synthetic feldspar deformed to large strain,

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“…Brown et al [16] Deep low-frequency earthquakes in tremor localize to the plate interface in multiple subduction zones. KanHayes et al [17] A threedimensional model of global subduction zone geometries.…”

Section: Introductionmentioning

confidence: 99%

Subduction Zone Characterization of the Northern Papua through the Study of Earthquake History

Janah¹,

Supriyadi²,

Yulianti³

et al. 2017

Preprint

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Papua is one of part in Indonesia which is the geology research of that place isn't developed and limited. It causes the seismotectonic of Papua hasn't been known. WinITDB was used to determine the dip angle plate which was on the north part of Papua. The determination of angle was done through seismicity's cross section analysis in the area. To show that seismicity, earthquake history data that ever occurred in the area is needed. The result on the seismicity's cross section of plane A-A', was confluence by two plates with angle 150° against horizontal on the depth up to ±68 km. On the seismicity's cross section of plane B-B' had angle 135° against horizontal on the ±82 km depth. On the plane C-C' seismicity's cross section, was confluence of two plate which located between -1,77°S until -4,97°S subducted until 171 km depth on 1,38°N -4,97°S. It proved that subduction characteristic in the northern Papua which was Australia continent plate subducted to north, followed by collision and the Pacific plate subduction on New Guinea. It is also confirmed by focus mechanism analysis which showed the earthquake activities are controlled by the not really deep active fault.

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Deep low‐frequency earthquakes in tremor localize to the plate interface in multiple subduction zones

Cited by 176 publications

References 28 publications

Slow slip events in Costa Rica detected by continuous GPS observations, 2002–2011

Slow slip events in Costa Rica detected by continuous GPS observations, 2002–2011

Superplasticity and ductile fracture of synthetic feldspar deformed to large strain

Subduction Zone Characterization of the Northern Papua through the Study of Earthquake History

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