HYPOELLIPSE; a computer program for determining local earthquake hypocentral parameters, magnitude, and first-motion pattern
Open-File Report
99-23
By: John C. Lahr
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Abstract
This report provides Fortran source code and program manuals for HYPOELLIPSE, a computer program for determining hypocenters and magnitudes of near regional earthquakes and the ellipsoids that enclose the 68-percent confidence volumes of the computed hypocenters. HYPOELLIPSE was developed to meet the needs of U.S. Geological Survey (USGS) scientists studying crustal and sub-crustal earthquakes recorded by a sparse regional seismograph network. The program was extended to locate hypocenters of volcanic earthquakes recorded by seismographs distributed on and around the volcanic edifice, at elevations above and below the hypocenter. HYPOELLIPSE was used to locate events recorded by the USGS southern Alaska seismograph network from October 1971 to the early 1990s. Both UNIX and PC/DOS versions of the source code of the program are provided along with sample runs.
Suggested Citation
Lahr, J.C., 1999, HYPOELLIPSE; a computer program for determining local earthquake hypocentral parameters, magnitude, and first-motion pattern (Version 1.1, Revised 2012): U.S. Geological Survey Open-File Report 99-23, 1 v. 116 p. :ill. ;28 cm., https://doi.org/10.3133/ofr9923.
ISSN: 2331-1258 (online)
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | HYPOELLIPSE; a computer program for determining local earthquake hypocentral parameters, magnitude, and first-motion pattern |
| Series title | Open-File Report |
| Series number | 99-23 |
| DOI | 10.3133/ofr9923 |
| Edition | Version 1.1, Revised 2012 |
| Year Published | 1999 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Contributing office(s) | Earthquake Science Center, Menlo Park Science Center |
| Description | 1 v. 116 p. :ill. ;28 cm. |
| Online Only (Y/N) | Y |