Space Geodesy and the New Madrid Seismic Zone
نویسندگان
چکیده
منابع مشابه
Time-variable deformation in the New Madrid seismic zone.
New geodetic measurements show that the New Madrid is currently deforming too slowly, if at all, to account for large earthquakes in the region over the past 5000 years. This result, together with increasing evidence for temporal clustering and spatial migration of earthquake sequences in continental interiors, indicates that either tectonic loading rates or fault properties vary over a few tho...
متن کاملThe New Madrid Seismic Zone: not dead yet.
The extent to which ongoing seismicity in intraplate regions represents long-lived aftershock activity is unclear. We examined historical and instrumental seismicity in the New Madrid central U.S. region to determine whether present-day seismicity is composed predominantly of aftershocks of the 1811-1812 earthquake sequence. High aftershock productivity is required both to match the observation...
متن کاملSlow deformation and lower seismic hazard at the new madrid seismic zone
Global Positioning System (GPS) measurements across the New Madrid seismic zone (NMSZ) in the central United States show little, if any, motion. These data are consistent with platewide continuous GPS data away from the NMSZ, which show no motion within uncertainties. Both these data and the frequency-magnitude relation for seismicity imply that had the largest shocks in the series of earthquak...
متن کاملRegional Stress Orientations and Slip Compatibility of Earthquake Focal Planes in the New Madrid Seismic Zone
The New Madrid seismic zone (NMSZ) in the central United States is one of the most active regions of intraplate seismicity in North America and site of the devastating 1811–1812 earthquake sequence (Nuttli, 1973; Johnston and Schweig, 1996). The NMSZ lies within the NE–SW trending Reelfoot rift (Fig. 1), which represents a failed rift arm that developed during the Late Proterozoic and Early Cam...
متن کاملIs the New Madrid seismic zone hotter and weaker than its surroundings?
A fundamental question about continental intraplate earthquakes is why they are where they are. For example, why are the New Madrid seismic zone earthquakes concentrated on the Reelfoot rift when the continent contains many fossil structures that would seem equally likely candidates for concentrated seismicity? A key to answering this question is understanding of the thermal-mechanical structur...
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ژورنال
عنوان ژورنال: Eos, Transactions American Geophysical Union
سال: 2008
ISSN: 0096-3941
DOI: 10.1029/2008eo280003