Seismic cycle and plate margin deformation in Costa Rica: GPS observations from 1994 to 1997

Lundgren, P.; Protti, M.; Donnellan, Andrea; Heflin, M. B.; Hernandez, E.; Jefferson, D. C.

doi:10.1029/1999jb900283

Cited by 60 publications

(61 citation statements)

References 31 publications

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“…This is in agreement with the discussions presented by several authors, e.g. Boschman et al (2014), Benford et al (2012), Calais et al (2016), DeMets et al (2007, Leroy and Mauffret (1996), Lundgren et al (1999), and Symithe et al (2015).…”

Section: Resulting Deformation Fieldsupporting

confidence: 92%

Crustal deformation and surface kinematics after the 2010 earthquakes in Latin America

Sánchez

Drewes

2016

Journal of Geodynamics

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Section: Resulting Deformation Fieldsupporting

confidence: 92%

Crustal deformation and surface kinematics after the 2010 earthquakes in Latin America

Sánchez

Drewes

2016

Journal of Geodynamics

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“…Convergence obliquity across the trench varies from offshore Nicaragua, where it is as much as 25°, to nearly orthogonal convergence southeast of the Nicoya Peninsula (DeMets, 2001;Turner et al, 2007). The variations in plate age, convergence rate, and slab dip influence the thermal structure of the margin (Harris et al, 2010b), and the variation in the convergent obliquity has implications for slip partitioning as indicated by focal mechanisms and GPS displacement data (Lundgren et al, 1999;McCaffrey, 2002;Norabuena et al, 2004;Turner et al, 2007;LaFemina et al, 2009). …”

Section: The Cocos Ridge and Subducting Cocos Platementioning

confidence: 99%

Expedition 344 summary

Li¹,

Malinverno²,

Torres³

et al. 2013

Proceedings of the IODP

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Expedition 344 summaryProc. IODP | Volume 344 2 from velocity-strengthening to velocity-weakening friction, and shear becomes localized. The onset of seismogenic behavior is correlated with the intersection of the 100°-150°C isotherm and the subduction thrust (Hyndman et al., 1997;Oleskevich et al., 1999). With increasing depth down the subduction thrust, the frictional characteristics undergo a second transition either due to the juxtaposition with the forearc mantle or because the rocks are heated to 350°-450°C and can no longer store elastic stresses needed for rupture. Transitional regions between the three zones have conditional stability and can host rupture but are generally not thought to be regions where large earthquakes initiate.Although this three-zone two-dimensional view of the subduction thrust provides a reasonable framework, it is simplistic. Rupture models for large subduction earthquakes suggest significant fault plane heterogeneity in slip and moment release that in three dimensions is characterized as patchiness (Bilek and Lay, 2002). Additionally, we now know the transition zone from stable to unstable sliding is not simple but hosts a range of fault behaviors that includes creep events, strain transients, slow and silent earthquakes, and low-frequency earthquakes (Peng and Gomberg, 2010;Beroza and Ide, 2011;Ide, 2012).Fundamentally unknown are the processes that change fault behavior from stable sliding to stick-slip behavior. Understanding these processes is important for understanding earthquakes, the mechanics of slip, and rupture dynamics. For a fault to undergo unstable slip, fault rocks must have the ability to store elastic strain, be velocity weakening, and have sufficient stiffness. Hypotheses for mechanisms leading to the transition between stable and unstable slip invoke temperature, pressure, and strain-activated processes that lead to downdip changes in the mechanical properties of rocks. These transitions are also sensitive to fault zone composition, lithology, fabric, and fluid pressures.The composition of the material in the fault zone and its contrast with the surrounding wall rock play a key role in rock frictional behavior. The frictional state of the incoming sediment changes progressively with increasing temperature and pressure as it travels downdip. Important lithologic factors influencing friction are composition, fabric, texture, and cementation of rocks, as well as fluid pore pressure (Bernabé et al., 1992;Moore and Saffer, 2001;Beeler, 2007;Marone and Saffer, 2007;Collettini et al., 2009). For example, fault rocks with high phyllosilicate content are generally weaker than rocks with low phyllosilicate content (Ikari et al., 2011). Sediment properties including porosity, permeability, consolidation state, and alteration history also exert a strong influence on fault zone behavior. At erosive margins, where the plate boundary cuts into the overriding plate, the composition and strength of the upper plate is also important (McCaffrey, 1993).Field observations and la...

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“…Three events (M7.5, M7.3, andM7.4) in 1938 off Fukushima andIbaraki Prefectures [Murotani (2003), green, purple and navy], four events off Miyagi Prefecture in 1936 [Yamanaka & Kikuchi (2004), M7.5, maroon], 1978 [Yamanaka & Kikuchi (2004), M7.4, magenta], 1981 [Yamanaka & Kikuchi (2004), M7.1, lime] and 2003 [Yamanaka (2003), M6.8, cyan], the Tokachi-oki earthquakes in 1968 [Yamanaka & Kikuchi (2004), M7.9, blue] and 2003 [Yamanaka & Kikuchi (2003), M8.0, teal], the Nemuro-oki earthquake in 1973 [Yamanaka (2005), M7.4, red] and the 2011 Off the Pacific Coast of Tohoku Earthquake [Iinuma et al (2012) a number of studies have applied this idea to the estimation of the distribution of interplate coupling patches in subduction zones based on surface displacement fields (e.g. Hyndman & Wang 1995;Norabuena et al 1998;Lundgren et al 1999;Wallace et al 2004).…”

Section: Spatio-temporal Change In Interplate Couplingmentioning

confidence: 99%

Monitoring of the spatio-temporal change in the interplate coupling at northeastern Japan subduction zone based on the spatial gradients of surface velocity field

Iinuma

2017

Geophysical Journal International

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S U M M A R YA monitoring method to grasp the spatio-temporal change in the interplate coupling in a subduction zone based on the spatial gradients of surface displacement rate fields is proposed. I estimated the spatio-temporal change in the interplate coupling along the plate boundary in northeastern (NE) Japan by applying the proposed method to the surface displacement rates based on global positioning system observations. The gradient of the surface velocities is calculated in each swath configured along the direction normal to the Japan Trench for time windows such as 0.5, 1, 2, 3 and 5 yr being shifted by one week during the period of 1997-2016. The gradient of the horizontal velocities is negative and has a large magnitude when the interplate coupling at the shallow part (less than approximately 50 km in depth) beneath the profile is strong, and the sign of the gradient of the vertical velocity is sensitive to the existence of the coupling at the deep part (greater than approximately 50 km in depth). The trench-parallel variation of the spatial gradients of a displacement rate field clearly corresponds to the trenchparallel variation of the amplitude of the interplate coupling on the plate interface, as well as the rupture areas of previous interplate earthquakes. Temporal changes in the trench-parallel variation of the spatial gradient of the displacement rate correspond to the strengthening or weakening of the interplate coupling. We can monitor the temporal change in the interplate coupling state by calculating the spatial gradients of the surface displacement rate field to some extent without performing inversion analyses with applying certain constraint conditions that sometimes cause over-and/or underestimation at areas of limited spatial resolution far from the observation network. The results of the calculation confirm known interplate events in the NE Japan subduction zone, such as the post-seismic slip of the 2003 M8.0 Tokachi-oki and 2005 M7.2 Miyagi-oki earthquakes and the recovery of the interplate coupling around the rupture area of the 1994 M7.6 Sanriku-Haruka-oki earthquake. The results also indicate the semi-periodic occurrence of slow slip events and the expansion of the area of slow slip events before the 2011 Tohoku-oki earthquake (M9.0) approaching the hypocentre of the Tohoku-oki earthquake.

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Seismic cycle and plate margin deformation in Costa Rica: GPS observations from 1994 to 1997

Cited by 60 publications

References 31 publications

Crustal deformation and surface kinematics after the 2010 earthquakes in Latin America

Crustal deformation and surface kinematics after the 2010 earthquakes in Latin America

Expedition 344 summary

Monitoring of the spatio-temporal change in the interplate coupling at northeastern Japan subduction zone based on the spatial gradients of surface velocity field

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