Crustal thickness and bulk Poisson ratios in the Dominican Republic from receiver function analysis

Kumar, Sachin; Agrawal, Mohit; Pulliam, J.; Rivera, E.; Huerfano, V.

doi:10.1016/j.tecto.2019.228308

Cited by 6 publications

(24 citation statements)

References 51 publications

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“…This value is consistent with the estimate of 21.7 km obtained by Kumar et al. (2020) from H‐κ stacking that assumed an isotropic medium. The arrival at ∼2.0 s changes polarity twice on the transverse RF across the full backazimuth range, that is, it forms a two‐lobed pattern.…”

Section: Resultssupporting

confidence: 92%

“…The results for PODR and NEDR are consistent with Moho depth estimates (21.3 and 21.7 km depth) by Kumar et al. (2020), suggesting that the Moho represents the contact between the crust and the Caribbean Plate, which is likely to be anisotropic. This conclusion is consistent with the model of Núñez et al.…”

Section: Resultssupporting

confidence: 89%

“…The HD model of RFs at ∼2.55 s suggests that this arrival may result from an interface at a depth of ∼22 km beneath this station, comparable to the estimate of ∼21.3 km obtained by Kumar et al. (2020) via H‐ κ stacking. The HD model (Figure S1c in Supporting Information ) shows a positive amplitude on the k = 0 term at the time that corresponds to the interface at ∼22 km depth, and a significantly negative amplitude in the cos(2 φ ) term.…”

Section: Resultssupporting

confidence: 87%

“…In this study, we combine a local crustal model (Kumar et al., 2020) with a global model of the upper mantle (ak135; Kennett et al., 1995) to convert receiver functions to depth. Kumar et al.…”

Section: Methodsmentioning

confidence: 99%

“…Kumar et al. (2020) used the H‐κ stacking method of Zhu and Kanamori (2000) to estimate Moho depths and Vp / Vs ratios beneath seismic stations of Hispaniola Island. We use a bootstrap resampling technique (100 iterations) to estimate uncertainties on the HD models, which are displayed in light green on each of the harmonic traces.…”

Section: Methodsmentioning

confidence: 99%

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Modeling Seismic Anisotropy Beneath the Island of Hispaniola via the Harmonic Decomposition of Receiver Functions

Kumar

Agrawal

Pulliam

2023

Geochem Geophys Geosyst

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The Caribbean Island of Hispaniola resulted from plate convergence that brought together distinct terranes and may include one or more active microplates. These processes may have brought seismically anisotropic materials to the island or created anisotropic structures through deformation. Our goal is to identify and model interfaces that bound seismically anisotropic media and/or dipping interfaces between isotropic layers beneath Hispaniola and assess the implications of our results for the region's tectonics. We perform harmonic decomposition of receiver function gathers for 17 broadband seismic stations deployed on the island. Our results reveal (a) a layer bounded by interfaces that produce opposite polarity on the transverse receiver functions at 25 and 41 km depth in the northern and eastern Dominican Republic that corresponds to the subducting North American oceanic lithosphere, (b) a layer at ∼8–17 km depth (also bounded by interfaces that produce opposite polarity) beneath the Cordillera Central in the central and eastern parts of the island that may indicate the crystalline, well‐differentiated lower crust of this long‐lived terrane, and (c) an interface that bounds anisotropic material at 22 km depth beneath southwestern Hispaniola. This last interface may correspond to the underthrusting Caribbean Large Igneous Province (CLIP), in which case it would mark the CLIP's upper boundary and the lower boundary is too gradual a transition to produce conversions.

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Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 89%

Section: Resultssupporting

confidence: 87%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Modeling Seismic Anisotropy Beneath the Island of Hispaniola via the Harmonic Decomposition of Receiver Functions

Kumar

Agrawal

Pulliam

2023

Geochem Geophys Geosyst

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A seismic investigation of lithospheric velocities beneath the Chhotanagpur Plateau (India) using waveform modeling of shear-coupled PL waves and other phases

Das

Agrawal

Patel

2023

Journal of Asian Earth Sciences

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Active Tectonics, Quaternary Stress Regime Evolution and Seismotectonic Faults in Southern Central Hispaniola: Implications for the Quantitative Seismic Hazard Assessment

Escuder‐Viruete,

Fernández,

Pérez Valera

et al. 2024

Geochem Geophys Geosyst

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Present‐day convergence between Caribbean and North American plates is accommodated by subduction zones, major active thrusts and strike‐slip faults, which are probably the source of the historical large earthquakes on Hispaniola. However, little is known of their geometric and kinematic characteristics, slip rates and seismic activity over time. This information is important to understand the active tectonics in Hispaniola, but it is also crucial to estimate the seismic hazard in the region. Here we show that a relatively constant NE‐directed shortening controlled the geometry and kinematics of main active faults in southern central Hispaniola, as well as the evolution of the Quaternary stress regime. This evolution included a pre‐Early Pleistocene D1 event of NE‐trending compression, which gave rise to the large‐scale fold and thrust structure in the Cordillera Central, Peralta Belt, Sierra Martín García and San Juan‐Azua basin. This was followed by a near pure strike‐slip D2 stress regime, partitioned into the N‐S to NE‐SW transverse Ocoa‐Bonao‐La Guácara and Beata Ridge fault zones, as well as subordinate structures in related sub‐parallel deformation corridors. Shift to D2 strike‐slip deformation was related to indentation of the Beata Ridge in southern Hispaniola from the Early to Middle Pleistocene and continues today. D2 was locally coeval by a more heterogeneous and geographically localized D3 extensional deformation. Defined seismotectonic fault zones divide the region into a set of simplified seismogenic zones as starting point for a seismic hazard modeling. Highest peak ground acceleration values computed in the Ocoa Bay establish a very high seismic hazard.

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Crustal thickness and bulk Poisson ratios in the Dominican Republic from receiver function analysis

Cited by 6 publications

References 51 publications

Modeling Seismic Anisotropy Beneath the Island of Hispaniola via the Harmonic Decomposition of Receiver Functions

Modeling Seismic Anisotropy Beneath the Island of Hispaniola via the Harmonic Decomposition of Receiver Functions

A seismic investigation of lithospheric velocities beneath the Chhotanagpur Plateau (India) using waveform modeling of shear-coupled PL waves and other phases

Active Tectonics, Quaternary Stress Regime Evolution and Seismotectonic Faults in Southern Central Hispaniola: Implications for the Quantitative Seismic Hazard Assessment

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