Measuring instruments | Pasisrl
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Metodologie
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HAMMER SWITCH [it]
Come fissare lo starter piezoelettrico sulla mazza di battuta
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3DLG2 [it]
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GEMINI2 [it]
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GFA [it]
Brochure
Gemini2 [it]
Brochure
Isotta [it]
Brochure
RM1 [it]
Brochure
Polares-32 [it]
Brochure
P200 [it]
Brochure
WMS-INT [it]
Manuali
WMS-02 [it]
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WMS-INT [it]
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WMS-LTC [it]
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P200 [it]
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POLARES32 [it]
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RM1 [it]
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ENCODER [it]
Articolo scientifico
Evaluation of soil liquefaction potential with a holistic approach: a case study from Araklı (Trabzon, Turkey) [en]
by A.E. Babacan S. Ceylan
This study focuses on demonstrating how a holistic approach based on geophysical, geotechnical, and Artificial Neural Network (ANN) methods in a region where urban development is intense will crucially contribute to the assessment of liquefaction potential. The liquefaction potential of the coastal part of the Araklı district of Trabzon has been evaluated. First, earthquake scenarios for different magnitudes, which may affect the study area, were produced. Maximum acceleration values to use in liquefaction analysis were calculated from the scenarios. Second, geophysical data were collected using seismic refraction, multichannel analysis of surface waves, electrical resistivity tomography, and ambient vibrations measures. In addition, results of standard penetration test were taken from the drillings in the region. The liquefaction potential using these data was also determined by ANN. The results show that the studied area has a serious risk of liquefaction and the more reliable liquefaction estimates are performed in the study area with the holistic approach. The results of this study will be of great importance for taking necessary measures in constructing engineering projects in the region, especially along the coastline.
Pubblicato su
https://www.researchgate.net/journal/Bollettino-di-Geofisica-Teorica-ed-Applicata-0006-6729
Atto di convegno
In situ shear wave velocity from multichannel analysis of surface waves (MASW) tests at six sites of Delhi Technological University [en]
by Rajat Gautama, A.K. Shrivastavab, Shubham Guptac, Vishal Sharmad
In the mid-1980s, the surface wave method was initially exhibited as an instrument for the geotechnical engineering field. This non-obtrusive seismic method of multi-channel examination of surface waves is prominently used to draw out the shear-wave velocity profile (variation of soil with respect to its depth). In an attempt to increase the sureness in the construed shear wave velocity (Vs) profile as a result of the ambiguity in the analysed dispersion characteristics, the multichannel method is used in this research to characterize six test sites on the campus of Delhi Technological University, Delhi. The multi-channel analysis of surface waves (MASW) method commenced from the traditional seismic survey method that engages twenty-four receivers positioned all along a linear survey track. The current study implies results from MASW survey at six sites within the DTU campus, for which the MASW data acquisition comprise of the use of a 24-channel PASI seismograph and 24 numbers of 4.5 Hz Vertical geo-phones set apart at 2 m each and source offset (2 m,4 m). The seismic power source was a steel sledgehammer (15 lbs). In order to develop and invert the surface-wave seismic data in addition to creating the one-dimensional depth versus Shear Wave Velocity (Vs) profiles WinMasw software was used. The mean shear wave velocity of the current study area is 285 m/sec. The mean shear wave velocity for Delhi city is in a range of 110 to 350 m/s.
Pubblicato su
https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3554919
Articolo scientifico
IMPLEMENTATION OF SEISMIC HAZARD MITIGATION ON THE BASIS OF GROUND SHEAR STRAIN INDICATOR FOR SPATIAL PLAN OF BENGKULU CITY, [en]
by Muhammad Farid, Lindung Zalbuin Mase
Bengkulu, a city on west coast of Sumatra Island Indonesia, is very vulnerable to undergo earthquake and other natural hazards. A seismic hazard mitigation should be prioritised in this developing city. This paper presents the seismic hazard mapping on the basis of shear strain indicator for spatial plan in Bengkulu City, Indonesia. The values of ground shear strain can be the indicator for the possible damage that could occur in an area. This study was initiated by performing geophysical measurements using microtremor to obtain the geophysical description of study area. The analysis of horizontal to vertical spectral ratio (H/V) was further performed to determine peak amplitude (A0) and predominant frequency (f0). From those parameters, the empirical analyses of vulnerability indices (Kg) and ground shear strain (γ) were conducted. All results such as A0, f0, Kg, and γ were depicted in microzonation maps. The results showed that Bengkulu City was generally vulnerable to undergo seismic impact. The concern was focused along coastal area of Bengkulu City since the liquefaction damage could occur in this area. Results of this study could bring a recommendation to stakeholders to consider seismic hazard mitigation for Bengkulu City
Pubblicato su
https://geomatejournal.com/geomate/article/view/1539
Manuali
BFK [it]
Manuali
BFK-FF [it]
Manuali
BFM [it]
Brochure
GEOFONI [it]
Brochure
BFK [it]
Brochure
BFK-FF [it]
Brochure
BFM [it]
Brochure
WMS-02 [it]
Brochure
WMS-LTC [it]
Brochure
PM8000 lite [en]
Brochure
OS120 PT [it]
Brochure
OS120 PM [it]
Brochure
Equotip 550 [it]
Brochure
PM8000 Pro [en]
Brochure
Pundit LAB [it]
Brochure
PET [it]
Brochure
CHUM [it]
Brochure
BIT [en]
Brochure
Dy-2 [it]
Brochure
Resipod [it]
Manuali
Hammer switch [it]
Come fissare lo starter piezoelettrico sulla mazza di battuta
Articolo scientifico
Integrated geophysical and geotechnical investigation for the rehabilitation of a water storage reservoir in Crete, Greece [en]
by Christos Orfanos, Konstantinos Leontarakis, George Apostolopoulos, Haralambos Gouvas
The main aim of the integrated geophysical and geotechnical investigation is the assessment of the soil condition of the broader area of an existing artificial water storage reservoir in Crete, Greece (Figure 1). It concerns the rehabilitation of the Agioi Theodoroi water storage reservoir located at the SW of Stomio bay (approximately 200 m from the shoreline) and near the Xiropotamos River. The name of the water reservoir comes from the church of the community of Vathis in the municipality of Kissamos in the Regional Unit of Chania, in Crete.
Articolo scientifico
Characterization of Aquifers in Metamorphic Rocks by Combined Use of Electrical Resistivity Tomography and Monitoring of Spring Hydrodynamics [en]
by Maja Briški, Andrej Stroj, Ivan Kosović, Staša Borović
Crystalline rocks are generally characterized by negligible porosity and permeability in terms of groundwater exploitability. However, alteration processes can greatly increase their fracture permeability and induce formation of modest, but locally important aquifers. Therefore, subsurface characteristics of alteration zones are of major importance for hydrogeological evaluation of crystalline terrains. Alteration processes greatly a ect rock total porosity and water content, causing contrasting electrical resistivity of rocks a ected by varying degrees of weathering.
Articolo scientifico
Seismic hazard microzonation of Bengkulu City, Indonesia [en]
by Lindung Zalbuin Mase1, Nanang Sugianto, Refrizon
It has been known that Bengkulu City (Indonesia) is vulnerable to undergo seismic damage. This study is initiated by measuring horizontal to vertical spectral ratio (H/V) to sites in Bengkulu City using microtremor. The inversion analysis is performed to generate shear wave velocity profile. Hundreds of sites are investigated in this study. The results show that observed H/V is consistent with the theoretical H/V. National Earthquake Hazard Reduction Program code is adopted to classify the site class. The results also exhibit that Bengkulu City is dominated by Site Classes C and D. In general, this study could lead local government to consider seismic hazard mitigation for spatial plan.
Articolo scientifico
Geological and geophysical test to model a small landslide in the Langhe hills [en]
by Sabrina Bonetto, Cesare Comina, Andrea Giuliani and Giuseppe Mandrone
In April 2009, North-West Italy was interested by heavy rainfalls that triggered several landslides, especially of shallow type, and caused relevant rise of water level in many rivers, in some cases even beyond the alert level. Particularly in the hills near Alba (NW Italy), many landslides occurred, most of them belonging to the debris flow or soil slip types. In this area, a small but interesting landslide involved a local road and a high quality, recently planted, vineyard. The present study shows the use of different disciplinary approaches focused to understand the behaviour of this landslide: in particular, besides geological and geomorphologic studies, detailed topographic and geophysical surveys together with an in situ geotechnical/geomechanic characterization were applied. The combined interpretation of the different techniques and of field observations allowed to define a geological and technical model of the landslide, both in surface than in depth, that clarified the triggering mechanism of the landslide and allowed to perform a back analysis on both strength and pore pressure parameters.