(11C) Seismic Reflection Methods Applied to Engineering, Environmental & Groundwater

01072019, 02:22 AM
Post: #1




(11C) Seismic Reflection Methods Applied to Engineering, Environmental & Groundwater
An extract from Seismic Reflection Methods Applied to Engineering, Environmental, and Groundwater Problems, Kansas Geological Survey, KU (Lawrence, KS).
… determine the seismic velocity within the materials penetrated by the reflected seismic waves. The simplest procedure with good seismicreflection data is to fit a hyperbola to the data using a leastsquares approach. Table 1 shows a simple program for a HP11C or HP15C calculator that will calculate seismic velocity for such a case. The user simply inputs two or more timedistance pairs of numbers from a reflection on the field record or from the CDP gathers to calculate a seismic velocity. The program also calculates the reflection time for the zerooffset distance for the hyperbola … Table 1. Shown is a program that will run on either an HP 11C or HP 15C pocket calculator. The program (1) uses two or more timedistance pairs (distance treated as x and time as y) measured from a field seismogram as input data; (2) performs an hyperbolic leastsquares fit of the data, assuming the timedistance pairs are picked from a true reflector; (3) calculates, stores, and displays zerooffset reflection time (TO), velocity (Vnmo), depth to reflecting interface (z), and correlation coefficient (r). The program assumes flatlying as opposed to dipping reflectors … BEST! SlideRule 

« Next Oldest  Next Newest »

User(s) browsing this thread: 1 Guest(s)