scholarly journals Rayleigh–Love discrepancy highlights temporal changes in near‐surface radial anisotropy after the 2004 Great Sumatra Earthquake

2021 ◽  
Author(s):  
W. Yu ◽  
T.‐R. A. Song ◽  
J. Su ◽  
J.‐T. Lin
Keyword(s):  
Temporal Changes ◽  
Sumatra Earthquake ◽  
Near Surface ◽  
Radial Anisotropy

scholarly journals Rayleigh-Love discrepancy highlights temporal changes in near-surface radial anisotropy after the 2004 Great Sumatra Earthquake

2021 ◽  
Author(s):  
Wen-Che Yu ◽  
Teh-Ru Alex Song ◽  
Jun Su ◽  
Jiun-Ting Lin
Keyword(s):  
Temporal Changes ◽  
Sumatra Earthquake ◽  
Near Surface ◽  
Radial Anisotropy

Near surface radial anisotropy in the Rigan area/SE Iran

2017 ◽  
Vol 694 ◽  
pp. 23-34 ◽  
Author(s):  
Taghi Shirzad ◽  
Zaher-Hossein Shomali ◽  
Mohammad-Ali Riahi ◽  
Maziar Jarrahi
Keyword(s):  
Near Surface ◽  
Radial Anisotropy

scholarly journals Soil water content evaluation considering time-invariant spatial pattern and space-variant temporal change

2013 ◽  
Vol 10 (10) ◽  
pp. 12829-12860
Author(s):  
W. Hu ◽  
B. C. Si
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Spatial Patterns ◽  
Root Zone ◽  
Temporal Changes ◽  
Near Surface ◽  
Varying Coefficients ◽  
Space And Time ◽  
Time Invariant

Abstract. Soil water content (SWC) varies in space and time. The objective of this study was to evaluate soil water content distribution using a statistical model. The model divides spatial SWC series into time-invariant spatial patterns, space-invariant temporal changes, and space- and time-dependent redistribution terms. The redistribution term is responsible for the temporal changes in spatial patterns of SWC. An empirical orthogonal function was used to separate the total variations of redistribution terms into the sum of the product of spatial structures (EOFs) and temporally-varying coefficients (ECs). Model performance was evaluated using SWC data of near-surface (0–0.2 m) and root-zone (0–1.0 m) from a Canadian Prairie landscape. Three significant EOFs were identified for redistribution term for both soil layers. EOF1 dominated the variations of redistribution terms and it resulted in more changes (recharge or discharge) in SWC at wetter locations. Depth to CaCO3 layer and organic carbon were the two most important controlling factors of EOF1, and together, they explained over 80% of the variations in EOF1. Weak correlation existed between either EOF2 or EOF3 and the observed factors. A reasonable prediction of SWC distribution was obtained with this model using cross validation. The model performed better in the root zone than in the near surface, and it outperformed conventional EOF method in case soil moisture deviated from the average conditions.

Identification of near-surface fractures via seismic-radial anisotropy

2018 ◽  
Author(s):  
Jer-Yu Jeng ◽  
Roohollah Askari ◽  
Snehamoy Chatterjee ◽  
Reza Dolatabadi
Keyword(s):  
Near Surface ◽  
Radial Anisotropy

Correlation of near surface fractures with seismic radial anisotropy: An approach for near surface fracture identification

2020 ◽  
Vol 173 ◽  
pp. 103925 ◽  
Author(s):  
Jer-Yu Jeng ◽  
Roohollah Askari ◽  
Snehamoy Chatterjee
Keyword(s):  
Surface Fracture ◽  
Near Surface ◽  
Radial Anisotropy ◽  
Fracture Identification

scholarly journals Temporal Changes of Near‐Surface Air Temperature in Poland for 1781–2016 and in Tbilisi (Georgia) for 1881–2016

2020 ◽  
Vol 7 (10) ◽  
Author(s):  
R. Modzelewska ◽  
M. V. Alania ◽  
N. I. Kapanadze ◽  
E. I. Khelaia
Keyword(s):  
Air Temperature ◽  
Surface Air Temperature ◽  
Temporal Changes ◽  
Near Surface

Temporal Changes in Moisture Content of the Active Layer and Near-Surface Permafrost at Barrow, Alaska, U.S.A.: 1962-1994

1996 ◽  
Vol 28 (3) ◽  
pp. 300 ◽  
Author(s):  
K. M. Hinkel ◽  
F. E. Nelson ◽  
Y. Shur ◽  
Jerry Brown ◽  
K. R. Everett
Keyword(s):  
Moisture Content ◽  
Active Layer ◽  
Temporal Changes ◽  
Near Surface

scholarly journals Temporal changes of seismic velocities in the San Jacinto Fault zone associated with the 2016 Mw 5.2 Borrego Springs earthquake

2019 ◽  
Vol 220 (3) ◽  
pp. 1536-1554 ◽  
Author(s):  
Hongrui Qiu ◽  
Gregor Hillers ◽  
Yehuda Ben-Zion
Keyword(s):  
Fault Zone ◽  
Temporal Changes ◽  
Coda Wave ◽  
Seismic Velocities ◽  
Rupture Directivity ◽  
Lapse Time ◽  
Near Surface ◽  
Fault Surface ◽  
San Jacinto Fault ◽  
San Jacinto Fault Zone

SUMMARY We study temporal changes of seismic velocities associated with the 10 June 2016 Mw 5.2 Borrego Springs earthquake in the San Jacinto fault zone, using nine component Green's function estimates reconstructed from daily cross correlations of ambient noise. The analysed data are recorded by stations in two dense linear arrays, at Dry Wash (DW) and Jackass Flat (JF), crossing the fault surface trace ∼3 km northwest and southeast of the event epicentre. The two arrays have 9 and 12 stations each with instrument spacing of 25–100 m. Relative velocity changes (δv/v) are estimated from arrival time changes in the daily correlation coda waveforms compared to a reference stack. The obtained array-average δv/v time-series exhibit changes associated with the Borrego Springs event, superposed with seasonal variations. The earthquake-related changes are characterized by a rapid coseismic velocity drop followed by a gradual recovery. This is consistently observed at both arrays using time- and frequency-domain δv/v analyses with data from different components in various frequency bands. Larger changes at lower frequencies imply that the variations are not limited to the near surface material. A decreasing coseismic velocity reduction with coda wave lapse time indicates larger coseismic structural perturbations in the fault zone and near-fault environment compared to the surrounding rock. Observed larger changes at the DW array compared to the JF array possibly reflect the northwestward rupture directivity of the Borrego Springs earthquake.

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