THE UPPER-TRUNCATED POWER LAW APPLIED TO EARTHQUAKE CUMULATIVE FREQUENCY-MAGNITUDE DISTRIBUTIONS: EVIDENCE FOR A TIME-INDEPENDENT SCALING PARAMETER
- DSpace Home
- →
- Геология России
- →
- ELibrary
- →
- View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.
dc.contributor.author | Burroughs S.M. | |
dc.contributor.author | Tebbens S.F. | |
dc.date.accessioned | 2021-09-28T02:28:16Z | |
dc.date.available | 2021-09-28T02:28:16Z | |
dc.date.issued | 2002 | |
dc.identifier | https://elibrary.ru/item.asp?id=14129131 | |
dc.identifier.citation | Bulletin of the Seismological Society of America, 2002, 92, 8, 2983-2993 | |
dc.identifier.issn | 0037-1106 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/30633 | |
dc.description.abstract | Earthquake cumulative frequency-magnitude (CFM) distributions are described by the Gutenberg-Richter power law where the exponent is the b-value. Although it has been reported that the b-value changes before large earthquakes, we find that an upper-truncated power law applied to earthquake CFM distributions yields a time-independent scaling parameter, herein called the α-value. We analyze earthquakes associated with subduction of the Nazca plate beneath South America and find a region of isolated seismic activity at depths greater than 500 km between 20° S and 30° S. For the entire record, 1973-2000, the earthquake CFM distribution in this isolated region is well described by a Gutenberg-Richter power law with b = 0.58. The data set includes several large seismic events with mb≥6.8. A power law applied to the CFM distributions for short time intervals between the large events yields b-values greater than the b-value for the entire record. CFM distributions for the short time intervals are better described by an upper-truncated power law than by a power law. The α-value determined by applying an upper-truncated power law to the short time intervals is equal to the b-value obtained by applying the Gutenberg-Richter power law to the entire record. Temporal changes in b-value are due to temporal fluctuations in maximum magnitude. Analysis of four Flinn-Engdahl regions, two in subduction zones and two along spreading ridges, demonstrates wider applicability of the results. The α-value is an unchanging characteristic of the system that may be determined from a short-term record. | |
dc.title | THE UPPER-TRUNCATED POWER LAW APPLIED TO EARTHQUAKE CUMULATIVE FREQUENCY-MAGNITUDE DISTRIBUTIONS: EVIDENCE FOR A TIME-INDEPENDENT SCALING PARAMETER | |
dc.type | Статья |
Files in this item
This item appears in the following Collection(s)
-
ELibrary
Метаданные публикаций с сайта https://www.elibrary.ru