Geophysical setting of the Reelfoot Rift and relations between rift structures and the New Madrid seismic zone

Hildenbrand, Thomas G.; Hendricks, J.D.

doi:10.3133/pp1538e

Cited by 97 publications

(130 citation statements)

References 43 publications

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“…This Nd isotopic boundary coincides with linear geophysical trends along much of its trace (Hinze et al, 1985;Hildenbrand and Kucks, 1992;Hildenbrand and Hendricks, 1995), including a pronounced northeast-trending geophysical anomaly near St. Charles, Missouri ( Figure 6). For simplicity, we collectively refer to these geochemical and geophysical features as the St. Charles lineament (SCL).…”

Section: The St Charles Lineamentmentioning

confidence: 76%

“…The Commerce geophysical lineament (CGL) was first identified as a series of narrow, discontinuous, northeast-trending magnetic and gravity highs extending for more than 400 km (Figure 1) from northeastern Arkansas to the Wabash River Valley (Hildenbrand and Hendricks, 1995;Langenheim and Hildenbrand, 1997). Inverse modeling of aeromagnetic and gravity data by Langenheim and Hildenbrand (1997) indicated that the source of these anomalies is a mafic dike swarm of unknown age and that the CGL is probably related to the parallel Reelfoot rift.…”

Section: Commerce Geophysical Lineamentmentioning

confidence: 98%

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Tectonic Framework of the Southwestern Margin of the Illinois Basin and Its Influence on Neotectonism and Seismicity

Harrison

Schultz

2002

Seismological Research Letters

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Section: The St Charles Lineamentmentioning

confidence: 76%

Section: Commerce Geophysical Lineamentmentioning

confidence: 98%

Tectonic Framework of the Southwestern Margin of the Illinois Basin and Its Influence on Neotectonism and Seismicity

Harrison

Schultz

2002

Seismological Research Letters

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“…This high-velocity anomaly is not resolved in the S wave velocity models or in the P wave velocity model obtained using the C' starting model. In addition, there is no supporting evidence for the high-velocity feature in the gravity or magnetic anomaly maps for the region [Hildenbrand and Hendricks, 1995;Langenhelm, 1994]. The most plausible explanation for the high-velocity anomaly is that it is an artifact of the inversion performed using C as the starting model.…”

Section: Datamentioning

confidence: 99%

Three‐dimensional S wave velocity structure and V_p/V_s ratios in the New Madrid Seismic Zone

Vlahovic¹,

Powell²

2001

J. Geophys. Res.

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Abstract. A three-dimensional S wave velocity model for the New Madrid Seismic Zone (NMSZ) has been developed using nonlinear travel time tomography. The inversion utilized 5544 S wave arrival times from 720 earthquakes recorded by digital, three-component stations deployed in the NMSZ over the time period 1989 through 1992. We imaged S wave velocity anomalies ranging from -5% to +8% relative to the starting one-dimensional velocity model. Lowest S wave velocities are found south of Ridgley, Tennessee, in an area characterized by a high earthquake swarm rate and shallower than normal hypocenters. Two centers of higher than average S wave velocity are located west of the Mississippi river, north of Caruthersville, Missouri. The S wave model is similar to a P wave velocity model generated using the same earthquake data set. The similarity in ray coverage in both the P and S wave solutions allowed calculation of Vp/Vs ratios.

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“…Whereas thrust events on the Reelfoot fault have been identified as the location for at least one of the large events in 1812 and 1450 [Carlson and Guccione, 2010], other large events are suggested to have occurred on the Cottonwood Grove fault, Bootheel lineament, and the New Madrid north fault [Hildenbrand and Hendricks, 1995;Johnston and Schweig, 1996;Mueller and Pujol, 2001], or outside the New Madrid seismic zone altogether [Hough et al, 2005]. The magnitude and return period of these earthquakes have been at the center of scientific debate in recent years.…”

Section: Introductionmentioning

confidence: 99%

Crustal deformation in the New Madrid seismic zone and the role of postseismic processes

2015

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Global Navigation Satellite System data across the New Madrid seismic zone (NMSZ) in the central United States over the period from 2000 through 2014 are analyzed and modeled with several deformation mechanisms including the following: (1) creep on subsurface dislocations, (2) postseismic frictional afterslip and viscoelastic relaxation from the 1811–1812 and 1450 earthquakes in the NMSZ, and (3) regional strain. In agreement with previous studies, a dislocation creeping at about 4 mm/yr between 12 and 20 km depth along the downdip extension of the Reelfoot fault reproduces the observations well. We find that a dynamic model of postseismic frictional afterslip from the 1450 and February 1812 Reelfoot fault events can explain this creep. Kinematic and dynamic models involving the Cottonwood Grove fault provide minimal predictive power. This is likely due to the smaller size of the December 1811 event on the Cottonwood Grove fault and a distribution of stations better suited to constrain localized strain across the Reelfoot fault. Regional compressive strain across the NMSZ is found to be less than 3 × 10−9/yr. If much of the present‐day surface deformation results from afterslip, it is likely that many of the earthquakes we see today in the NMSZ are aftershocks from the 1811–1812 New Madrid earthquakes. Despite this conclusion, our results are consistent with observations and models of intraplate earthquake clustering. Given this and the recent paleoseismic history of the region, we suggest that seismic hazard is likely to remain significant.

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Geophysical setting of the Reelfoot Rift and relations between rift structures and the New Madrid seismic zone

Cited by 97 publications

References 43 publications

Tectonic Framework of the Southwestern Margin of the Illinois Basin and Its Influence on Neotectonism and Seismicity

Tectonic Framework of the Southwestern Margin of the Illinois Basin and Its Influence on Neotectonism and Seismicity

Three‐dimensional S wave velocity structure and V_p/V_s ratios in the New Madrid Seismic Zone

Crustal deformation in the New Madrid seismic zone and the role of postseismic processes

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Geophysical setting of the Reelfoot Rift and relations between rift structures and the New Madrid seismic zone

Cited by 97 publications

References 43 publications

Tectonic Framework of the Southwestern Margin of the Illinois Basin and Its Influence on Neotectonism and Seismicity

Tectonic Framework of the Southwestern Margin of the Illinois Basin and Its Influence on Neotectonism and Seismicity

Three‐dimensional S wave velocity structure and Vp/Vs ratios in the New Madrid Seismic Zone

Crustal deformation in the New Madrid seismic zone and the role of postseismic processes

Contact Info

Product

Resources

About

Three‐dimensional S wave velocity structure and V_p/V_s ratios in the New Madrid Seismic Zone