Large earthquake paleoseismology in the East Tennessee seismic zone: Results of an 18-month pilot study

2013 ◽  
pp. 111-142 ◽  
Author(s):  
Robert D. Hatcher ◽  
James D. Vaughn ◽  
Stephen F. Obermeier
Keyword(s):  
Pilot Study ◽  
Large Earthquake ◽  
Seismic Zone ◽  
East Tennessee

scholarly journals Identification of earthquake precursors in the hydrogeochemical and geoacoustic data for the Kamchatka peninsula by flicker-noise spectroscopy

2011 ◽  
Vol 11 (2) ◽  
pp. 541-548 ◽  
Author(s):  
G. V. Ryabinin ◽  
Yu. S. Polyakov ◽  
V. A. Gavrilov ◽  
S. F. Timashev
Keyword(s):  
Statistical Physics ◽  
Systems Approach ◽  
Flicker Noise ◽  
Large Earthquake ◽  
Kamchatka Peninsula ◽  
Time Frame ◽  
Underground Water ◽  
Ion Concentration ◽  
Seismic Zone ◽  
Noise Spectroscopy

Abstract. A phenomenological systems approach for identifying potential precursors in multiple signals of different types for the same local seismically active region is proposed based on the assumption that a large earthquake may be preceded by a system reconfiguration (preparation) on different time and space scales. A nonstationarity factor introduced within the framework of flicker-noise spectroscopy, a statistical physics approach to the analysis of time series, is used as the dimensionless criterion for detecting qualitative (precursory) changes within relatively short time intervals in arbitrary signals. Nonstationarity factors for chlorine-ion concentration variations in the underground water of two boreholes on the Kamchatka peninsula and geacoustic emissions in a deep borehole within the same seismic zone are studied together in the time frame around a large earthquake on 8 October 2001. It is shown that nonstationarity factor spikes (potential precursors) take place in the interval from 70 to 50 days before the earthquake for the hydrogeochemical data and at 29 and 6 days in advance for the geoacoustic data.

Noise to signal: A microtremor study at liquefaction sites in the New Madrid Seismic Zone

Geophysics ◽  
2010 ◽  
Vol 75 (3) ◽  
pp. B83-B90 ◽  
Author(s):  
Kelli Hardesty ◽  
Lorraine W. Wolf ◽  
Paul Bodin
Keyword(s):  
Strong Motion ◽  
Sedimentary Basins ◽  
Large Earthquake ◽  
Sedimentary Facies ◽  
New Madrid Seismic Zone ◽  
Seismic Zone ◽  
Mississippi Embayment ◽  
Ground Failure ◽  
Liquefaction Susceptibility ◽  
New Madrid

Understanding how sedimentary basins respond to seismic-wave energy generated by large earthquake events is a significant concern for seismic-hazard estimation. This study explores the use of microtremors, or ambient noise, for evaluating strong-motion site effects. The study focuses on the Mississippi Embayment in the New Madrid Seismic Zone, where widespread liquefaction and ground failure occurred during the 1811–1812 earthquake sequence. Spectral analyses of microtremor data at sites representing different environments of deposition (and sedimentary facies), different embayment thicknesses, and varying liquefaction susceptibility show correlations between (1) calculated vulnerability indices and evidence of liquefaction, (2) sediment thickness and fundamental resonant frequency, and (3) subsurface stratigraphic boundaries and observed peaks in horizontal-to-vertical spectral ratios. Results of the study suggest that the microtremor method could be helpful in identifying those areas most vulnerable to ground amplification in intraplate sedimentary basins, where large earthquakes are infrequent but potentially damaging.

PALEOSEISMIC INVESTIGATIONS IN THE EAST TENNESSEE SEISMIC ZONE

2016 ◽  
Author(s):  
Robert D. Hatcher ◽  
◽  
Jacob C. Glasbrenner ◽  
Randel Tom Cox
Keyword(s):  
Seismic Zone ◽  
East Tennessee

New evidence for a large earthquake in the New Madrid seismic zone between A.D. 1400 and 1670

Geology ◽  
1999 ◽  
Vol 27 (9) ◽  
pp. 771 ◽  
Author(s):  
M. P. Tuttle ◽  
J. Collier ◽  
L. W. Wolf ◽  
R. H. Lafferty
Keyword(s):  
Large Earthquake ◽  
New Madrid Seismic Zone ◽  
Seismic Zone ◽  
New Evidence ◽  
New Madrid

Seismic gaps in Hawaii

1992 ◽  
Vol 82 (3) ◽  
pp. 1373-1387
Author(s):  
Max Wyss ◽  
R. Y. Koyanagi
Keyword(s):  
Accumulation Rate ◽  
Tectonic Setting ◽  
Large Earthquake ◽  
Seismogenic Zone ◽  
Seismic Zone ◽  
Fault Creep ◽  
The South ◽  
Seismic Gaps ◽  
Oceanic Sediments ◽  
Southern Half

Abstract We propose that two seismic gaps exist in southern Hawaii. From their dimensions and tectonic setting, we estimate that the south Kona gap may be capable of a mainshock in the magnitude range of 714 to 712, while the east Kona gap will probably not produce earthquakes larger than M=612. During historic time (1832 to the present), no mainshocks have occurred in these gaps. Since there is no evidence that fault creep relieves stress in these areas, we expect earthquakes to fill these gaps. The boundaries of the south Kona gap are defined by the approximate rupture extent of the earthquakes of 2 April 1868 (M = 7.9) and 21 August 1951 (M = 6.9), those of the east Kona gap by the latter mainshock and the extent of the seismogenic zone. The seismotectonic model on which we base our gap hypothesis defines a major seismic zone in the southern half of the island of Hawaii. We propose that most major and large earthquakes within this zone are of a decollement type, in which the upper 10 km of the crust is pushed seaward along a near-horizontal plane of weakness, provided by the oceanic sediments buried beneath the volcanic edifice. The direction of slip is away from the volcano summits and perpendicularly away from the volcano rifts. Several recurrence intervals are known for the Kaoiki area, where M = 6 ± 0.6 mainshocks occur every 10.4 ± 1.5 years. For the Kalapana area, one recurrence interval of 108 years is known for earthquakes with 7 < M < 8. In most of the major seismic zone in Hawaii, the recurrence times are not known, and no information on strain accumulation rate is available. It is therefore not possible to estimate when the portion of the 1868 rupture that has not re-ruptured yet (southern Kau) will produce another large mainshock. The potential for a large earthquake in this area is estimated to be intermediate. The potential in the Kalapana, the central Kona, and northern Kona areas are estimated to be low for the next several decades.

Pilot study on criteria in cavity preparation-facts or artifacts?

1973 ◽  
Vol 37 (11) ◽  
pp. 27-31 ◽  
Author(s):  
G Salvendy ◽  
WM Hinton ◽  
GW Ferguson ◽  
PR Cunningham
Keyword(s):  
Pilot Study ◽  
Cavity Preparation

Assessing manual dexterity: pilot study of a new instrument

1981 ◽  
Vol 45 (2) ◽  
pp. 71-73 ◽  
Author(s):  
P Weinstein ◽  
HA Kiyak
Keyword(s):  
Pilot Study ◽  
Manual Dexterity ◽  
New Instrument

A Pilot Study of Early Storybook Reading With Babies With Hearing Loss

2019 ◽  
Vol 62 (9) ◽  
pp. 3397-3412
Author(s):  
Michelle I. Brown ◽  
David Trembath ◽  
Marleen F. Westerveld ◽  
Gail T. Gillon
Keyword(s):  
Hearing Loss ◽  
Pilot Study ◽  
Visual Analysis ◽  
Single Case ◽  
Eye Contact ◽  
Preliminary Evidence ◽  
Storybook Reading ◽  
Book Selection ◽  
Turn Taking ◽  
Parent Child

Purpose This pilot study explored the effectiveness of an early storybook reading (ESR) intervention for parents with babies with hearing loss (HL) for improving (a) parents' book selection skills, (b) parent–child eye contact, and (c) parent–child turn-taking. Advancing research into ESR, this study examined whether the benefits from an ESR intervention reported for babies without HL were also observed in babies with HL. Method Four mother–baby dyads participated in a multiple baseline single-case experimental design across behaviors. Treatment effects for parents' book selection skills, parent–child eye contact, and parent–child turn-taking were examined using visual analysis and Tau-U analysis. Results Statistically significant increases, with large to very large effect sizes, were observed for all 4 participants for parent–child eye contact and parent–child turn-taking. Limited improvements with ceiling effects were observed for parents' book selection skills. Conclusion The findings provide preliminary evidence for the effectiveness of an ESR intervention for babies with HL for promoting parent–child interactions through eye contact and turn-taking.

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