Introduction

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1 OYO Corporation Tsukuba Technical Research and Development Center Engineering Geophysics R&D Dept. Seismic refraction analysis software Introduction and Installation

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Transcript of Introduction

Page 1: Introduction

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OYO CorporationTsukuba Technical Research and Development Center

Engineering Geophysics R&D Dept.

Seismic refraction analysis software

Introduction and Installation

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Seismic Refraction Analysis withSeisImager/2D

• PickWin95 (Picking first arrival)• PlotRefa(Seismic refraction analysis)<<Introduction>>SeisImager/2D is the two-dimensional seismic refraction analysis software. It consits of two-software, named “PickWin95” and “PlotRefa”. “PickWin95” is a software for picking first arrival. “Plotrefa” is a software for seismic refraction analysis. Following analysis approach can be used in the “PlotRefa”.1:Time-term methodIf the velocity model is a simple horizontal two-layer model, you can use the “time-term method”. The time-term method is a simple linear least square method for two-layer velocity model2:Reciprocal method (Hagiwara’s method)If the number of layers is larger than three, you can use “reciprocal method”. Sometimes, it is called GRM, or Hagiwara’s method.3:Tomographic analysisThe tomographic analysis can image velocity model almost automatically. It can handle surface data as well as the data obtained from sources and receivers in boreholes or tunnels.

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Seismic Refraction Analysis withSeisImager/2D

•Waveform data : SEG2, OYO McSEIS-170;170f; SX,SX-48ch.

•Maximum data : trace 610 *samples 16384.•Picking first arrival : automatic picking,

manual picking with a mouse. •Wave processing : power spectrum,

band pass filter, stacking, notch filter,velocity filter, correlation.

•Waveform view : wiggle/variable view,normalize, clipping.

•etc. : Show traveltime curveson waveform data

Picking first arrival : PickWin95

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Seismic refraction analysis : PlotRefa •Maximum data : source 200 *receiver 1000 * layer 50

•Traveltime checking : traveltime correction with a mouse, traveltime difference curve,automatic correction for reciprocal traveltime.

•Time-term method : linear least square method fortwo-layer velocity model.

•Reciprocal method : layer assignment,reduced traveltime curves,

delay time calculation, delay time view,generating velocity model.

•Raytracing : based on Huygens’ principle,comparison of observed and calculated data,raypaths view.

•Automatic correction for layered model : non-linear least square method, correction for layerthickness, correction for layer velocity.

•Tomographic nalysis : generating initial model,inversion based on non-linear least square method,conversion into layerd model.

•etc. : analysis with borehole and tunnel data,modeling (model generation, raytracing).

Seismic Refraction Analysis withSeisImager/2D

Raytracing based on Huygens’ principle

Comparison of observed and calculated traveltimes

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Processing flow

Final result

PickWin95

PlotRefa

Waveform data

Picking first arrival

Reciprocal method

Layered model

Automatic correction

Layered modelInitial model

Tomographic analysis

Smooth model

Layered model

Checking traveltime curves

Time-term method

PickWin95 Tutorial

PlotRefa Tutorial 2PlotRefa Tutorial 1

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Installation• For Windows 2000 : Install to your PC.

• For Windows95&98 : Install from within the

at first, then install from the root directory

of the CD .

• For Windows NT : Install from within the at first,

then install from the root directory of the CD .

• Start from

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Sample data(OYO McSEIS-SX data)

• Source locationMc001_sx.org : 2.5m (250cm)Mc002_sx.org : 34.2m (3420cm)Mc003_sx.org : 65.8m (6580cm)Mc004_sx.org : 97.5m (9750cm)

• Receivers : 0~100m, 5m interval

• Elevation data : elevation.txt

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Contact us• Technical questions : to Koichi Hayashi

OYO Corporation (http://www.oyo.co.jp)Tsukuba Technical Research and Development Center, Engineering Geophysics R&D Dept. 43 Miyukigaoka, Tsukuba, Ibaraki, 305-0841, JapanTel : +81-298-51-6621, Fax : +81-298-51-5450E-mail : [email protected]

• Purchase (U.S.A., Europe, etc.) : toGeometrics (http://www.geometrics.com)2190 Fortune Dr. San Jose, Ca. 95131, U.S.A.Tel : +1-408-954-0522, Fax : +1-408-954-0902 E-mail : [email protected]

• Purchase (Japan, Korea, etc.) : to Nobuhito NagaiOYO Corporation (http://www.oyo.co.jp)Tsukuba Technical Research and Development Center, Instruments Division2-2-19, Daitakubo, Urawa, Saitama 336-0015, JAPANTel : +81-48-882-5371, Fax : +81-48-885-6424E-mail : [email protected]

http://www.oyo.co.jp/english/instru_e/soft/seisimager/

SeisImager/2D Homepage!


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