Download or read book Location And Characteristic Features of the Quaternary Deformation in the Mississippi Embayment from High resolution Seismic Reflection Data written by Lei Guo and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The New Madrid Seismic Zone (NMSZ), central US. is a controversial midcontinental region where the occurrence of large magnitude historical and prehistorical earthquakes and the high level of instrumental seismicity, clash with the lack of evident surface and subsurface deformation and with slow geodetic rates. To unravel this apparent paradox locally and to contribute to the understanding of intraplate seismicity globally, I integrate new high-resolution seismic reflection data acquired as part of the Mississippi River Project, data acquired for the Meeman-Shelby Fault study, and existing seismic reflection data, to investigate the long-term deformation in the northern Mississippi Embayment. In particular this study focuses on the identification and characterization of the structures where Quaternary deformation is accommodated in the northern Mississippi Embayment, on the comparison of the newly discovered structures with those that are seismically active today, and on the analysis of the distribution of the Quaternary deformation with respect to the NMSZ. The results show that Quaternary deformation has been accommodated along adjacent faults additional to the NMSZ fault system, and that the NMSZ faults are virtually undistinguishable from quiescent faults, except for the instrumental seismicity. The distribution of Quaternary deformation extends beyond the footprint of the high-velocity lower crustal layer (i.e. & ldquo;mafic rift pillow & rdquo;), invoked by several geodynamic models as the possible feature capable of concentrating stress in this region and responsible for the seismicity in the central US. The long-term Quaternary deformation appears to be accommodated along pre-existing features predominantly associated with the Reelfoot Rift structure.
Download or read book U S Geological Survey Open file Report written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Variations in the Seismic Quality Factor Q for the Mississippi Embayment Sediments Utilizing Spectral Analysis of Reflection Data written by Michael Wilson Towle and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A natural log spectral ratio technique is used to calculate Qp for the post-Paleozoic, unconsolidated sediments of the northern Mississippi Embayment. The method is applied to high-resolution marine seismic reflection data acquired along the Mississippi River. The method assumes a frequency independent Q over a certain frequency band. The frequency bands inspected range from 10-150 Hz and 10-200 Hz based on observed linear trends in the spectral ratio data. The large volume of data available allows for increased accuracy in Q estimates. Values of Qs are then approximated using an empirical Qp/Qs relationship for the embayment. Results show that average Qp=100-160 and average Qs=50-80. These values are nearly twice those calculated in previous studies, therefore suggesting that attenuation within the unconsolidated sediment column may not cancel out site amplification effects. These effects have important implications for seismic hazards and ground displacement predictions in the Central U.S. region.
Download or read book National Earthquake Hazards Reduction Program Summaries of Technical Reports Volume XXXV written by and published by . This book was released on 1994 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book National Earthquake Hazards Reduction Program Annual Project Summaries XXXVI written by and published by . This book was released on 1995 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book General Geology of the Mississippi Embayment written by Elliott Morse Cushing and published by . This book was released on 1964 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Shallow Deformation Along the Crittenden County Fault Zone Near the Southeastern Margin of the Reelfoot Rift Northeastern Arkansas written by and published by . This book was released on 1995 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Precambrian Rift Beneath the Mississippi Embayment written by Jie Zhang and published by . This book was released on 1989 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High resolution Shallow Seismic Reflection Surveys of the Northwest Reelfoot Rift Boundary Near Marston Missouri written by and published by . This book was released on 1995 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seismological Research Letters written by and published by . This book was released on 2006 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Neotectonics of the Northern Mississippi Embayment written by W. John Nelson and published by . This book was released on 1999 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recent Advances in North American Paleoseismology and Neotectonics East of the Rockies written by Randel Tom Cox and published by Geological Society of America. This book was released on 2012 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This volume focuses on the continental intraplate region of the United States and provides an update and overview of documented Quaternary faulting and paleoseismic liquefaction east of the Rocky Mountains, and of the application of these results to seismic hazard and risk assessments. Contributions include papers that describe zones of newly recognized Quaternary deformation such as the East Tennessee Seismic Zone, as well as reinterpretations of well-known areas such as the New Madrid Seismic Zone. The chapters make important contributions to the recognition of earthquake sources active during the Quaternary and assess the seismic hazards posed by these sources. This volume should interest a wide range of readers from geology, seismology, hazard assessment, and emergency management"--Provided by publisher.
Download or read book Geomorphology and Quaternary Geologic History of the Lower Mississippi Valley written by Roger T. Saucier and published by . This book was released on 1994 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geomorphic Evidence of Deformation in the Northern Part of the New Madrid Seismic Zone written by Karin Fischer Boyd and published by . This book was released on 1995 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Neotectonics of the Northern Mississippi Embayment written by W. John Nelson and published by . This book was released on 1999 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evidence of Quaternary Faulting Along a Prominent Topographic Lineament Northern Mississippi Embayment written by Sean Pinardi and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A prominent topographic lineament lays adjacent and parallel to the southeastern margin of the Reelfoot Rift. Recent paleoseismological studies suggest the southern segment of the lineament corresponds to a pair of steeply dipping strike-slip faults. However, the northern segment of the lineament is seismically quiescent and was mapped as a fluvial terrace riser by several geologists in the past. To ascertain whether the northern segment of the lineament could have been produced by faulting, the concavity of the lineament's slope was quantified and compared to that of several known fault scarp and terrace riser slopes. A hypsometric analysis was performed in order to assess whether any surface deformation related to faulting might have occured along the lineament, and electrical resistivity tomography was used to image subsurface features. When combined, results from these analyses strongly suggest mid-Quaternary faulting is responsible for creating the northern segment of the rift margin lineament.
Download or read book Quaternary Geology of the Lower Mississippi Valley written by Roger T. Saucier and published by . This book was released on 1974 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
