Surface Soil Effects Study Using Short-period Microtremor Observations in Almería City, Southern Spain

2002 ◽  
pp. 2481-2497
Author(s):  
M. Navarro ◽  
T. Enomoto ◽  
F. J. Sánchez ◽  
I. Matsuda ◽  
T. Iwatate ◽  
...  
Keyword(s):  
Surface Soil ◽  
Southern Spain ◽  
Short Period ◽  
Soil Effects

Surface Soil Effects Study Using Short-period Microtremor Observations in Almería City, Southern Spain

2001 ◽  
Vol 158 (12) ◽  
pp. 2481-2497 ◽  
Author(s):  
M. Navarro ◽  
T. Enomoto ◽  
F. J. Sánchez ◽  
I. Matsuda ◽  
T. Iwatate ◽  
...  
Keyword(s):  
Surface Soil ◽  
Southern Spain ◽  
Short Period ◽  
Soil Effects

The Use of Ambient Seismic Noise Measurements for the Estimation of Surface Soil Effects: The Motril City Case (Southern Spain)

2004 ◽  
Vol 161 (7) ◽  
pp. 1549-1559 ◽  
Author(s):  
Z. Al Yuncha ◽  
F. Luz�n ◽  
A. Posadas ◽  
J. Mart�n ◽  
G. Alguacil ◽  
...  
Keyword(s):  
Seismic Noise ◽  
Surface Soil ◽  
Southern Spain ◽  
Ambient Seismic Noise ◽  
Noise Measurements ◽  
Soil Effects

Geometrical spreading function for short-period S and coda waves recorded in southern Spain

1993 ◽  
Vol 80 (1-2) ◽  
pp. 25-36 ◽  
Author(s):  
J.M. Ibáñez ◽  
E. Del Pezzo ◽  
G. Alguacil ◽  
F. De Miguel ◽  
J. Morales ◽  
...  
Keyword(s):  
Southern Spain ◽  
Coda Waves ◽  
Geometrical Spreading ◽  
Short Period ◽  
Spreading Function

scholarly journals Statistical Exploration of SENTINEL-1 Data, Terrain Parameters, and in-situ Data for Estimating the Near-Surface Soil Moisture in a Mediterranean Agroecosystem

2021 ◽  
Vol 3 ◽  
Author(s):  
Sarah Schönbrodt-Stitt ◽  
Nima Ahmadian ◽  
Markus Kurtenbach ◽  
Christopher Conrad ◽  
Nunzio Romano ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Empirical Model ◽  
Surface Soil ◽  
Surface Soil Moisture ◽  
Channel Network ◽  
Near Surface ◽  
Short Period ◽  
Terrain Parameters ◽  
Simple Empirical Model

Reliable near-surface soil moisture (θ) information is crucial for supporting risk assessment of future water usage, particularly considering the vulnerability of agroforestry systems of Mediterranean environments to climate change. We propose a simple empirical model by integrating dual-polarimetric Sentinel-1 (S1) Synthetic Aperture Radar (SAR) C-band single-look complex data and topographic information together with in-situ measurements of θ into a random forest (RF) regression approach (10-fold cross-validation). Firstly, we compare two RF models' estimation performances using either 43 SAR parameters (θNovSAR) or the combination of 43 SAR and 10 terrain parameters (θNovSAR+Terrain). Secondly, we analyze the essential parameters in estimating and mapping θ for S1 overpasses twice a day (at 5 a.m. and 5 p.m.) in a high spatiotemporal (17 × 17 m; 6 days) resolution. The developed site-specific calibration-dependent model was tested for a short period in November 2018 in a field-scale agroforestry environment belonging to the “Alento” hydrological observatory in southern Italy. Our results show that the combined SAR + terrain model slightly outperforms the SAR-based model (θNovSAR+Terrain with 0.025 and 0.020 m3 m−3, and 89% compared to θNovSAR with 0.028 and 0.022 m3 m−3, and 86% in terms of RMSE, MAE, and R2). The higher explanatory power for θNovSAR+Terrain is assessed with time-variant SAR phase information-dependent elements of the C2 covariance and Kennaugh matrix (i.e., K1, K6, and K1S) and with local (e.g., altitude above channel network) and compound topographic attributes (e.g., wetness index). Our proposed methodological approach constitutes a simple empirical model aiming at estimating θ for rapid surveys with high accuracy. It emphasizes potentials for further improvement (e.g., higher spatiotemporal coverage of ground-truthing) by identifying differences of SAR measurements between S1 overpasses in the morning and afternoon.

Effects of oil mill wastes on surface soil properties, runoff and soil losses in traditional olive groves in southern Spain

CATENA ◽  
2011 ◽  
Vol 85 (3) ◽  
pp. 187-193 ◽  
Author(s):  
B. Lozano-García ◽  
L. Parras-Alcántara ◽  
M. del Toro Carrillo de Albornoz
Keyword(s):  
Soil Properties ◽  
Surface Soil ◽  
Southern Spain ◽  
Olive Groves ◽  
Surface Soil Properties ◽  
Soil Losses

The Origin of the Moon and its Relationship to the Origin of the Solar System

1962 ◽  
Vol 14 ◽  
pp. 133-148 ◽  
Author(s):  
Harold C. Urey
Keyword(s):  
Solar System ◽  
The Moon ◽  
The Past ◽  
The Earth ◽  
Short Period ◽  
Origin Of The Moon

During the last 10 years, the writer has presented evidence indicating that the Moon was captured by the Earth and that the large collisions with its surface occurred within a surprisingly short period of time. These observations have been a continuous preoccupation during the past years and some explanation that seemed physically possible and reasonably probable has been sought.

the effects of resonance with Jupiter in the system of short-period comets

1974 ◽  
Vol 22 ◽  
pp. 193-203
Author(s):  
L̆ubor Kresák
Keyword(s):  
Structural Effects ◽  
Order Resonance ◽  
Mean Motion ◽  
Short Period ◽  
The Mean ◽  
Compound Effect ◽  
Low Order

AbstractStructural effects of the resonance with the mean motion of Jupiter on the system of short-period comets are discussed. The distribution of mean motions, determined from sets of consecutive perihelion passages of all known periodic comets, reveals a number of gaps associated with low-order resonance; most pronounced are those corresponding to the simplest commensurabilities of 5/2, 2/1, 5/3, 3/2, 1/1 and 1/2. The formation of the gaps is explained by a compound effect of five possible types of behaviour of the comets set into an approximate resonance, ranging from quick passages through the gap to temporary librations avoiding closer approaches to Jupiter. In addition to the comets of almost asteroidal appearance, librating with small amplitudes around the lower resonance ratios (Marsden, 1970b), there is an interesting group of faint diffuse comets librating in characteristic periods of about 200 years, with large amplitudes of about±8% in μ and almost±180° in σ, around the 2/1 resonance gap. This transient type of motion appears to be nearly as frequent as a circulating motion with period of revolution of less than one half that of Jupiter. The temporary members of this group are characteristic not only by their appearance but also by rather peculiar discovery conditions.

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