Lithospheric velocity structure of the New Madrid Seismic Zone: A joint teleseismic and local P tomographic study

Zhang, Qie; Sandvol, Eric; Liu, Mian

doi:10.1029/2009gl037687

Cited by 28 publications

(27 citation statements)

References 33 publications

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“…To the southeast and northwest, the low‐V anomaly is surrounded by obvious high‐V zones that represent part of the cratonic lithosphere of the Granite‐Rhyolite Province (Pollitz & Mooney, ; Whitmeyer & Karlstrom, ). This pattern of low‐V and high‐V anomalies is consistent with those of surface‐wave tomography (Pollitz & Mooney, , ) and other body‐wave tomographic models (Chen et al, ; Nyamwandha et al, ; Zhang et al, ).…”

Section: Resultssupporting

confidence: 87%

Tomography, Seismotectonics, and Mantle Dynamics of Central and Eastern United States

et al. 2019

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We study the 3‐D P wave velocity structure of the crust and mantle down to 1,000‐km depth beneath the central and eastern United States. A 3‐D velocity model is obtained by conducting a joint inversion of 236,670 arrival times of local earthquakes and 870,455 relative traveltime residuals of teleseismic events recorded by the EarthScope/USArray Transportable Array. Significant low‐velocity (low‐V) anomalies are revealed in the crust beneath the eastern arm of the Midcontinent Rift and the Triassic Basins along the East Coast, whereas a prominent high‐velocity (high‐V) anomaly is visible beneath the Llano Uplift in central Texas. The stable North American Craton exhibits high‐V anomalies at depths of 65–250 km. Low‐V anomalies exist along the eastern and southern margins of the craton, which may reflect relatively thin lithosphere there. A prominent low‐V anomaly is revealed at depths of 50–200 km beneath the New Madrid Seismic Zone, which is bounded by high‐V anomalies to its southeast and northwest. This feature reflects a weak lithosphere surrounded by relatively strong cratonic regions and stress concentration caused intraplate seismicity in the New Madrid region. Two high‐V bodies appear in the mantle transition zone (410‐ to 660‐km depths) beneath the Interior Low Plateaus, the central Great Plains, and the Central Lowland, which may reflect the subducted Farallon plate or delaminated lithosphere. At depths of 800–1,000 km, a high‐V anomaly is visible beneath the southeast United States, which may be the subducted Hess Rise conjugate.

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Section: Resultssupporting

confidence: 87%

Tomography, Seismotectonics, and Mantle Dynamics of Central and Eastern United States

et al. 2019

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“…In seismic tomography results, regions with thinner lithosphere appear as low-velocity anomalies (Assumpção et al, 2004;Zhang et al, 2009;Rocha et al, 2011), which can be interpreted as regions of relatively higher temperature. Regions with thicker lithosphere, such as cratons, are characterized by stability and low temperatures, and normally appear as high-velocity anomalies in tomographic results.…”

Section: Motivationmentioning

confidence: 96%

Causes of intraplate seismicity in central Brazil from travel time seismic tomography

et al. 2016

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“…However, Zhang et al . [] imaged a broad region of NE‐SW trending low velocities between 17 and 40 km depths that abruptly stops along the Axial fault. This feature was interpreted as related to deformational fabrics or a preserved lithospheric weak zone associated with the Reelfoot rift.…”

Section: Discussionmentioning

confidence: 99%

Imaging the New Madrid Seismic Zone using double‐difference tomography

2013

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[1] Three-dimensional P and S wave velocity (V P and V S ) models and high-resolution earthquake relocations are determined for the New Madrid Seismic Zone using double-difference local earthquake tomography. The data set consists of arrival times and differential times recorded by the Cooperative New Madrid Seismic Network (CNMSN) from 2000 to 2007 and the 1989-1992 Portable Array Network and Data Acquisition deployment. Waveform cross correlation-derived differential times for the CNMSN data are also incorporated. The velocity solutions are compatible with previous solutions centered on the active arms of seismicity and cover a broader area, including mafic intrusions along the margin of the Reelfoot rift. Major features include elevated V P and V S associated with the mafic plutons and reduced V P and V S along and southeast of the Axial fault (AF), a major arm of seismicity trending along the rift axis. Low V P extends to a depth of at least 20 km along the portion of the AF that extends south of the Missouri bootheel. A locally high V P /V S anomaly imaged along the central portion of the Reelfoot fault is spatially correlated with a significant change in fault trend and is interpreted as a region containing high pore pressure and/or water-filled microcracks.

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Lithospheric velocity structure of the New Madrid Seismic Zone: A joint teleseismic and local P tomographic study

Cited by 28 publications

References 33 publications

Tomography, Seismotectonics, and Mantle Dynamics of Central and Eastern United States

Tomography, Seismotectonics, and Mantle Dynamics of Central and Eastern United States

Causes of intraplate seismicity in central Brazil from travel time seismic tomography

Imaging the New Madrid Seismic Zone using double‐difference tomography

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