Near-regional CMT and multiple-point source solution of the September 5, 2012, Nicoya, Costa Rica Mw 7.6 (GCMT) earthquake

Quintero, Ronnie; Zahradnı́k, Jiřı́; Sokos, Efthimios

doi:10.1016/j.jsames.2014.07.009

Cited by 13 publications

(6 citation statements)

References 21 publications

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“…The moment rate in the Feng locking model exhibits two peaks (Figure c), implying two subevents during the 2012 Nicoya earthquake. However, no kinematic solutions have claimed subevents of the Nicoya quake, and both kinematic models show a single peak in the moment rate function (Quintero et al, ; Ye et al, ). Therefore, we conclude that the coseismic scenarios derived from the Xue locking model appear to better fit the kinematic model of Yue et al () than did the scenarios from the Feng locking model.…”

Section: Discussionmentioning

confidence: 99%

“…(a) Coseismic slip distribution from numerical rupture scenario derived from the Xue locking model (blue), and kinematic source models (red: Yue et al, ; black: Protti et al, ), (b) final slip distribution from the Feng locking model, (c) moment rate functions from the numerical rupture scenarios (blue and purple), and two other kinematic source models (Quintero et al, ; Ye et al, ).…”

Section: Deriving Rupture Scenarios From Interseismic Locking Modelsmentioning

confidence: 99%

“…Joint inversion results using multiple sources of data such as teleseismic P waves and local strong motion and GPS observations indicated that the rupture propagated at a velocity of ~3.0 km/s and broke two patches with an average slip of ~2 m in the primary slip zone (Liu et al, ; Yue et al, ). Moment rate functions showed a relatively simple rupture process, with a single peak value of 2.3 − 2.7 × 10 19 Nm/s (Quintero et al, ; Ye et al, ).…”

Section: Interseismic Locking Models In the Nicoya Peninsula And The mentioning

confidence: 99%

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Deriving Rupture Scenarios From Interseismic Locking Distributions Along the Subduction Megathrust

Yang

Yao

et al. 2019

JGR Solid Earth

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Given recent advances in geodetic data, interseismic locking models along the megathrust now become useful to qualitatively evaluate future earthquake potential. However, an individual earthquake's true rupture potential is challenging, as it depends on more than just a static image of prior locking. Here, we test the determinism of interseismic locking models using spontaneous rupture simulations and the well-resolved processes associated with the 2012 moment magnitude (Mw) 7.6 Nicoya earthquake. To do so, we estimate initial megathrust stress from locking by assuming that the entire slip deficit will be released in the next megathrust earthquake. Then we initiate spontaneous ruptures at the hypocenter of the 2012 Nicoya earthquake. We find scenarios that approximate the same coseismic slip distribution and final earthquake moment magnitude as obtained from seismic and geodetic observations, demonstrating that deriving potential rupture scenarios from interseismic locking is feasible. We also find that spontaneous rupture scenarios from different locking models differ in moment rate duration and thus ground motion prediction, although the final slip distribution and moment magnitude were similar. The results highlight that quantifying rupture scenarios and ground motions from reliable locking models by dynamic rupture simulations can be an effective tool for seismic hazard assessment in subduction zones. Key Points:• We conduct numerical simulations of rupture scenarios based on interseismic locking models • Our simulated earthquake scenario is well consistent with kinematic models of the 2012 Mw 7.6 Nicoya earthquake • Details of rupture process and synthetic waveforms depend on the choice of the input locking model Supporting Information:• Supporting Information S1• Movie S1Note that the dynamic cohesive zone size is smaller than the static one (Day et al., 2005). Therefore, we tested mesh grid sizes of 400, 300, 250, and 200 m on the fault interface during dynamic rupture simulations. The results show that the final slip patterns are stable for 300, 250, and 200 m, while the slip amplitudes and moment magnitudes slightly differ ( Figure S2). Based on the grid size test, we select 250 m as the

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Section: Discussionmentioning

confidence: 99%

Section: Deriving Rupture Scenarios From Interseismic Locking Modelsmentioning

confidence: 99%

Section: Interseismic Locking Models In the Nicoya Peninsula And The mentioning

confidence: 99%

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Deriving Rupture Scenarios From Interseismic Locking Distributions Along the Subduction Megathrust

Yang

Yao

et al. 2019

JGR Solid Earth

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“…The CMT (point-source) calculations were made in a low-frequency range 0.02–0.05 Hz, using the least-squares determination of moment tensor and a spatial-temporal grid search. An extended range of 0.02–0.10 Hz was used to obtain multiple-point-source models, applying joint inversion of source pairs 18 , tested also elsewhere 48 49 .…”

Section: Methodsmentioning

confidence: 99%

A recent deep earthquake doublet in light of long-term evolution of Nazca subduction

Zahradnik

Čı́žková

Bina

et al. 2017

Sci Rep

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Earthquake faulting at ~600 km depth remains puzzling. Here we present a new kinematic interpretation of two Mw7.6 earthquakes of November 24, 2015. In contrast to teleseismic analysis of this doublet, we use regional seismic data providing robust two-point source models, further validated by regional back-projection and rupture-stop analysis. The doublet represents segmented rupture of a ∼30-year gap in a narrow, deep fault zone, fully consistent with the stress field derived from neighbouring 1976–2015 earthquakes. Seismic observations are interpreted using a geodynamic model of regional subduction, incorporating realistic rheology and major phase transitions, yielding a model slab that is nearly vertical in the deep-earthquake zone but stagnant below 660 km, consistent with tomographic imaging. Geodynamically modelled stresses match the seismically inferred stress field, where the steeply down-dip orientation of compressive stress axes at ∼600 km arises from combined viscous and buoyant forces resisting slab penetration into the lower mantle and deformation associated with slab buckling and stagnation. Observed fault-rupture geometry, demonstrated likelihood of seismic triggering, and high model temperatures in young subducted lithosphere, together favour nanometric crystallisation (and associated grain-boundary sliding) attending high-pressure dehydration as a likely seismogenic mechanism, unless a segment of much older lithosphere is present at depth.

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“…Multiple point source (MPS) model based on iterative deconvolution [Zahradník et al, 2005;Gallovič et al, 2013;Quintero et al, 2014;Hicks and Rietbrock, 2015] was applied to the near-regional data in the frequency range of 0.03-0.08 Hz. We used trial positions of point sources on a line passing through the centroid at azimuth of 20°(20 trial positions, spacing of 3 km).…”

Section: Methodsmentioning

confidence: 99%

Asperity break after 12 years: The M_w6.4 2015 Lefkada (Greece) earthquake

Sokos

Zahradnı́k

Gallovič

et al. 2016

Geophysical Research Letters

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The Mw6.4 earthquake sequence of 2015 in western Greece is analyzed using seismic data. Multiple point source modeling, nonlinear slip patch, and linear slip inversions reveal a coherent rupture image with directivity toward the southwest and several moment release episodes, reflected in the complex aftershock distribution. The key feature is that the 2015 earthquake ruptured a strong asperity, which was left unbroken in between two large subevents of the Mw6.2 Lefkada doublet in 2003. This finding and the well‐analyzed Cephalonia earthquake sequence of 2014 provide strong evidence of segmentation of the major dextral Cephalonia‐Lefkada Transform Fault (CTF), being related to extensional duplex transform zones. We propose that the duplexes extend farther to the north and that the CTF runs parallel to the western coast of Lefkada and Cephalonia Islands, considerably closer to the inhabited islands than previously thought. Generally, this study demonstrates faulting complexity across short time scales (earthquake doublets) and long time scales (seismic gaps).

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Near-regional CMT and multiple-point source solution of the September 5, 2012, Nicoya, Costa Rica Mw 7.6 (GCMT) earthquake

Cited by 13 publications

References 21 publications

Deriving Rupture Scenarios From Interseismic Locking Distributions Along the Subduction Megathrust

Deriving Rupture Scenarios From Interseismic Locking Distributions Along the Subduction Megathrust

A recent deep earthquake doublet in light of long-term evolution of Nazca subduction

Asperity break after 12 years: The M_w6.4 2015 Lefkada (Greece) earthquake

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Near-regional CMT and multiple-point source solution of the September 5, 2012, Nicoya, Costa Rica Mw 7.6 (GCMT) earthquake

Cited by 13 publications

References 21 publications

Deriving Rupture Scenarios From Interseismic Locking Distributions Along the Subduction Megathrust

Deriving Rupture Scenarios From Interseismic Locking Distributions Along the Subduction Megathrust

A recent deep earthquake doublet in light of long-term evolution of Nazca subduction

Asperity break after 12 years: The Mw6.4 2015 Lefkada (Greece) earthquake

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Asperity break after 12 years: The M_w6.4 2015 Lefkada (Greece) earthquake