ENHANCING DISPERSION-CURVE IMAGES FROM ABUNDANT PASSIVE SEISMIC SOURCES USING MULTICHANNEL ANALYSIS OF SURFACE WAVE (MASW) METHOD AT A SALT MINING SITE

2013 ◽  
Author(s):  
Julian Ivanov
Keyword(s):  
Surface Wave ◽  
Dispersion Curve ◽  
Seismic Sources ◽  
Mining Site ◽  
Multichannel Analysis ◽  
Passive Seismic ◽  
Masw Method ◽  
Salt Mining

DISPERSION-CURVE IMAGING CONSIDERATIONS WHEN USING MULTICHANNEL ANALYSIS OF SURFACE WAVE (MASW) METHOD

2015 ◽  
Author(s):  
Julian Ivanov ◽  
Richard D. Miller ◽  
Sarah Morton ◽  
Shelby Peterie
Keyword(s):  
Surface Wave ◽  
Dispersion Curve ◽  
Multichannel Analysis ◽  
Masw Method

scholarly journals Struktur Bawah Permukaan pada Lokasi Rencana Pembangunan Rumah Sakit Muhammadiyah Kota Bengkulu dengan Metode seismik MASW Secara 2 Dimensi

POSITRON ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 1
Author(s):  
Ashar Muda Lubis ◽  
Bella Satriani ◽  
Lizalidiawati Lizalidiawati ◽  
Rida Samdara
Keyword(s):  
Surface Wave ◽  
Shear Wave Velocity ◽  
Seismic Data ◽  
Rock Type ◽  
Soft Rock ◽  
Subsurface Structure ◽  
Multichannel Analysis ◽  
Hospital Construction ◽  
Masw Method ◽  
High Level

A study on the subsurface structure has been conducted using the multichannel analysis of surface wave (MASW) method near Tugu Hiu, Bengkulu City, the location where Muhammadiyah hospital will be built. We aimed to determine the subsurface structure in 2-Dimension (2D) to classify soil type on the location. The data were measured with seismograph PASI 16S24-P using 24 geophones for a track of 72 m of total length and 1.5 m of intervals. The seismic data were processed by using seismic ParkSeis software. The results show that shear wave velocity (Vs) is 800-1200 m/s at a depth of 1-5 m, indicating this layer is filled by rock type (unsaturated). At a depth of 6-8 m below surface, Vs value decreases to 400-500 m/s which may indicate that the soft rock type fills the layer. The results of this study provide a high level of confidence, about 80-100%, in the Vs value. Thus, we suggest for the foundation of hospital construction, the pillars for construction must be for more than 10 m in depth with a solid concrete foundation. This to ensure the foundation can withstand the building in case of shake during an earthquake.

Surface Wave Dispersion Imaging Using Improved τ-p Transform Approach

2013 ◽  
Vol 353-356 ◽  
pp. 1196-1202 ◽  
Author(s):  
Jian Qi Lu ◽  
Shan You Li ◽  
Wei Li
Keyword(s):  
Surface Wave ◽  
Phase Shift ◽  
Dispersion Curve ◽  
Wave Dispersion ◽  
S Wave ◽  
Surface Wave Dispersion ◽  
Narrow Frequency Range ◽  
Channel Analysis ◽  
Rayleigh Wave Dispersion

Surface wave dispersion imaging approach is crucial for multi-channel analysis of surface wave (MASW). Because the resolution of inversed S-wave velocity and thickness of a layer are directly subjected to the resolution of imaged dispersion curve. The τ-p transform approach is an efficient and commonly used approach for Rayleigh wave dispersion curve imaging. However, the conventional τ-p transform approach was severely affected by waves amplitude. So, the energy peaks of f-v spectrum were mainly gathered in a narrow frequency range. In order to remedy this shortage, an improved τ-p transform approach was proposed by this paper. Comparison has been made between phase shift and improved τ-p transform approaches using both synthetic and in situ tested data. Result shows that the dispersion image transformed from proposed approach is superior to that either from conventionally τ-p transform or from phase shift approaches.

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