SC3-RAV™ 2011 - Baziw Consulting Engineers Ltd.

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BCE SC3RAV 2011 Seismic Data Analysis Software For example (using the SCPTDEMO data in Figure 24), if the best arrival time occurred at 3.5 m and is estimated to be 33.5 ms, then the arrival time at 2.5 m would be 27.4 ms for a time shift of 6.1 ms (33.5 ms - 6.1 ms), the arrival time at 1.5 m would be 20.9 ms for a time shift of 6.5 ms (27.4 ms - 6.5 ms), and the arrival time at 4.5 m would be 43.1 ms for a time shift of 9.6 (33.5 ms + 9.6 ms). This process is carried out for the complete DST profile and then the corresponding Arrival Times are inputted with measurement weights set to reflect the corresponding crosscorrelation coefficient or typically set to 1.0. If the recorded seismic waves have poor correlation to one another, then the user can simply input arrival times based upon best estimates. The FMDSM database interface is a standard windows database where the user can filter specific sites and add in new sites with arrival time information. For example, Figure 24 shows the FMDSM database for sites SCPTDEMO, SCPT02, and SCPT03 (note: graphical button unfilters or displays all the DST sites). The user can then filter a specific site by highlighting a site within the scroll list of available sites (on bottom of the user interface window) and selecting graphical button . The filtered arrival time information for site SCPT03L is illustrated in Figure 25. The user processes a specific DST database by highlighting the specific database and selecting graphical button . A new database is specified in one of two ways: 1. Un-filter site list and go to the bottom of the list and move the cursor down one row and type in a new site name. Move cursor to Depth (m) and type in the corresponding depth, move to Arrival Time (ms) and type in appropriate arrival time, and finally move to Weight column and type in the appropriate measurement weight (usually 1.0). Figure 26 shows an example of the previously implemented steps for test site SCPTNew. 2. The above steps are again implemented, but in this case the database interface + is selected instead of moving to the bottom of the list. Figure 25: Filtering DST site SCPT03L Figure 26: Specifying a new DST FMDSM database Version 11.1.0 Page 17
BCE SC3RAV 2011 Seismic Data Analysis Software Once a first entry is made for the new site, the refresh data icon is selected and the newly created site can be filtered as is shown in Figure 27. The previously described steps are repeated for the DST profile (all available depths and corresponding arrival times are specified for the newly created DST site (i.e., SCPTNew)). Figure 27: Filtering a newly created database (SCPTNew) with the first row entry illustrated In summary, for the FMDSM database the user can insert additional or modify existing databases by selecting the appropriate Database Navigator Keys. The user can filter a specific database by either highlighting the Site Name in the database grid and selecting icon or by highlighting a database in the database list box, selecting check box Filtered Selected Site and then pressing icon . The user may un-filter the databases present by selecting icon . The user creates a new database by selecting the + menu option and specifying an appropriate Site Name with relevant depth, arrival time and/or relative arrival information with corresponding measurement weights (0-1). Once the user has populated the database under study with the appropriate time and weight information, the database must be filtered as previously described. The user then selects icon and is subsequently returned to the FMDSM main graphical screen previously illustrated in Figure 23. The user then selects icon so that the FMDSM algorithm is executed The user may abort the FMDSM by selecting icon . Upon completion of the FMDSM, the graphical screen illustrated in Figure 28 appears. The results shown in Figure 28 are derived with the SCPTDEMO database provided within the SC1-RAV software installation package. In this SCPTDEMO database there are measurements for depths from 0.5 m to 9.5 m with a depth increment of 1. In this example, the Source Depth Offset is set to 0 and the Source Radial Offset is 1.0 m. Figure 28: FMDSM graphical screen after completion of the interval velocity Version 11.1.0 Page 18
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