scholarly journals In situ ground deformation measurements from the summit of Axial Volcano during the 1998 volcanic episode

1999 ◽  
Vol 26 (23) ◽  
pp. 3437-3440 ◽  
Author(s):  
Christopher G. Fox
Keyword(s):  
Ground Deformation ◽  
Axial Volcano ◽  
Deformation Measurements

Comparative analyses of multifrequency PSI ground deformation measurements

2011 ◽  
Author(s):  
José R. Sabater ◽  
Javier Duro ◽  
Alain Arnaud ◽  
David Albiol ◽  
Fifamè N. Koudogbo
Keyword(s):  
Ground Deformation ◽  
Comparative Analyses ◽  
Deformation Measurements

scholarly journals Ground motion areas detection (GMA-D): an innovative approach to identify ground deformation areas using the SAR-based displacement time series

2020 ◽  
Vol 382 ◽  
pp. 277-284
Author(s):  
Roberta Bonì ◽  
Claudia Meisina ◽  
Linda Poggio ◽  
Alessandro Fontana ◽  
Giulia Tessari ◽  
...  
Keyword(s):  
Time Series ◽  
Synthetic Aperture Radar ◽  
Ground Motion ◽  
Coastal Plain ◽  
Ground Deformation ◽  
Innovative Approach ◽  
Synthetic Aperture ◽  
Ne Italy ◽  
Innovative Methodology

Abstract. In this work, an innovative methodology to generate the automatic ground motion areas mapping is presented. The methodology is based on the analysis of the Synthetic Aperture Radar (SAR)-based displacement time series. The procedure includes two modules developed using the ModelBuilder tool (ArcGis). These modules allow to identify the ground motion areas (GMA) using only one dataset and the persistent GMA (PGMA) considering the different monitored periods and datasets. These areas represent clusters of targets characterized by the same displacement time series trend. The procedure was tested using different sensors such as ERS-1/2, ENVISAT, COSMO-SkyMed and Sentinel-1 covering the periods, 1992–2000, 2003–2010, 2012–2016 and 2014–2017, respectively, over an area of about 500 km2 in the Venetian-Friulian coastal Plain (NE Italy). The resulting mapping allows to detect priority areas where to address further in situ investigations such as to verify the presence of localized buried landforms.

scholarly journals Timing of a large volcanic flank movement at Piton de la Fournaise Volcano using noise-based seismic monitoring and ground deformation measurements

2013 ◽  
Vol 195 (2) ◽  
pp. 1132-1140 ◽  
Author(s):  
D. Clarke ◽  
F. Brenguier ◽  
J.- L. Froger ◽  
N. M. Shapiro ◽  
A. Peltier ◽  
...  
Keyword(s):  
Ground Deformation ◽  
Seismic Monitoring ◽  
Piton De La Fournaise ◽  
Deformation Measurements

Anisotropic crystal deformation measurements determined using powder X-ray diffraction and a new in situ compression stage

2011 ◽  
Vol 418 (2) ◽  
pp. 199-206 ◽  
Author(s):  
Rahul V. Haware ◽  
Paul Kim ◽  
Lauren Ruffino ◽  
Brian Nimi ◽  
Catherine Fadrowsky ◽  
...  
Keyword(s):  
X Ray Diffraction ◽  
Anisotropic Crystal ◽  
X Ray ◽  
Compression Stage ◽  
Deformation Measurements

The Linhuaigang Main Dam Openings Vertical Interlocking Block Revetment Design and Calculation

2012 ◽  
Vol 212-213 ◽  
pp. 846-852
Author(s):  
Zhong Yang ◽  
Gui Sheng Wang
Keyword(s):  
Flood Control ◽  
Ground Deformation ◽  
Concrete Block ◽  
Earth Dam ◽  
High Wind ◽  
The Earth ◽  
Water Conservancy ◽  
Large Water ◽  
First Time

The design “non-rope opening vertical interlock block” is used in the main dam of Linhuaigang Project for the first time in China. The opening of the block can effectively reduce the uplift pressure induced by waves. The vertical interlock can make block interlock three- dimensionally so as to enhance the integrity of the block and improve the anti-wave performance. The design can not only improve the protection of the main dam slope under long blowing distance and high wind and waves, but also save the use of stone and construction investment as well as protect the environment. Openings vertical interlock concrete block between the rigid in-situ concrete slope and the flexible dry stone slope, not only avoid the shortcomings of in-situ concrete slope suited to soft ground deformation, but also resist the larger storms owing to the better integrity than dry stone pitching ,from the interlocked effect between the blocks. Compared with the entity block, opening vertical interlock block thickness is reduced greatly. The earth dam project of Lin Huai Gang flood control project applied openings vertical interlock block successfully in water conservancy projects .The project has the pioneering position in the use in the wave elements of reservoirs, lakes and the other large water conservancy revetment constructions.

Characterization of clay shrinking and swelling at the Chaingy site (Centre-Val de Loire) combining in situ extensometers, SMOS surface soil moistures and Sentinel-1 interferometric spaceborne measurements

2020 ◽  
Author(s):  
André Burnol ◽  
Michael Foumelis ◽  
Sébastien Gourdier ◽  
Daniel Raucoules
Keyword(s):  
Soil Moisture ◽  
Surface Soil ◽  
Clayey Soil ◽  
Ground Deformation ◽  
Water Infiltration ◽  
Insurance Companies ◽  
Spatial And Temporal Variability ◽  
Clay Layer ◽  
Time Frequency

<p>In France, the risk due to clay shrinking and swelling is the second most important cause of financial compensation from insurance companies behind flood risk. In 2010, BRGM published a first global hazard map, based on the 1:50 000 geological map, geotechnical data and spatial distribution of building damages. The traditional way to improve this map consists of monitoring instrumented experimental sites. Since September 2016, a new site has been implemented at Chaingy (Centre-Val de Loire) by choosing a clayey soil in an urban context exposed to a semi-oceanic climate. Two <em>in situ</em> extensometers (E1, E2) have been installed to monitor vertical displacements due to a continuous clay layer at a depth between about 80 cm and 160 cm and capacitive sensors have been deployed inside boreholes at about 120 cm depth to track soil moisture variations in clayey soils.</p><p>During a three-year period (September 2016 – September 2019), the extensometers show that the swelling peak level is attained during the spring (with a maximum of 10 millimeters in only 4 months) and the peak of ground settlement during the fall. Another result is a strong spatial and temporal variability comparing the two extensometers, spaced only about 12 m apart: the expansion is up to three times higher at E2 than at E1 during this period.</p><p>Another innovative way to improve the swelling-risk map is to use Synthetic Aperture Radar Interferometry (InSAR) technique. During the same 3-year period, the Copernicus Sentinel-1 acquisitions were processed using the P-SBAS (Parallel Small BAseline Subset) service of CNR-IREA to monitor the temporal evolution of ground deformation. Using both ascending and descending tracks, the motion in the vicinity of E1 and E2 reflects roughly the seasonal variation of the clay swelling and settlement. Moreover, the estimated displacement rates are consistent to both extensometers linear trends, taking into account averaging effects due to the spatial resolution of the InSAR measurements.</p><p>During the same 3-year period, the 10-day SMOS surface soil moisture (SSM) products for descending acquisition geometry are also used to calculate the average of the median, minimum and maximum SSM values. These surface moistures are in phase advance with respect to the soil moistures measurements at 1.2 m depth. The cross wavelet transform (XWT) between SSM and the vertical displacement at extensometer E2 reveals in the time/frequency space two different periods: 1) the seasonal period (one year), 2) another period (between 4 and 5 months). SSM shows an advance of phase with respect to vertical E2 displacement for both periods. This result is consistent with a water infiltration in the unsaturated zone followed by the swelling of the clay layer.</p><p>To a lesser extent, a similar correlation with a phase delay is observed using XWT between SSM and LOS displacement time series. As a perspective, the same method coupling both satellite acquisitions (Sentinel-1 and SMOS) may be generalized to improve the global French shrink/swell risk evaluation at a finer resolution.</p>

Sign in / Sign up

Export Citation Format

Share Document