Method and apparatus for detecting seismic events by identifying crossings in the Nth derivative of a waveform
US4727488A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 9, 1987 |
| Grant date | Feb 23, 1988 |
| Priority date | — |
| Expiry date | Apr 9, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V1/301
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electronic system automatically detects significant events in a seismic trace. The seismic trace is defined as a series of consecutive points, equally spaced in time. The system provides for taking the Nth derivative of the trace at each of the points. The system has the capability of identifying the time of the zero-crossings of the Nth derivative and of establishing the amplitude of the trace at the time of the zero-crossing of the Nth derivative. Memory is provided for storing the amplitude of the trace and the times of the zero crossings in the Nth derivative. Finally, displays are provided for displaying the traces and the zero-crossings in the Nth derivative as a hard copy of visual display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.