A general overview of the catalog of recent seismicity compiled by the Mexican Seismological Survey
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| Format: | Artículo científico |
| Langue: | en |
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Universidad Nacional Autónoma de México
2000
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| _version_ | 1876442227220152320 |
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| author | F. Ramón Zúñiga |
| author_facet | F. Ramón Zúñiga |
| contents | A general overview of the catalog of recent seismicity compiled by the Mexican Seismological Survey F. Ramón Zúñiga Carlos Valdés Marco A. Reyes Ciencias de la Tierra Mexico catalog Seismicity natural changes artificial changes We have analyzed the catalog of recent (1974-1998) seismicity in Mexico, based on the automatically compiled reports ofthe Servicio Sismológico Nacional (Mexican Seismological Survey). To this end, we employed various tools developed for theanalysis of seismic catalogs as well as for detailed studies of seismicity characteristics. Such tools comprise both newly developedtechniques and traditional methods which deal with the subject of artificial and natural variations of seismicity. We found that thetime characteristics of reporting suffered a drastic change during 1988. Before 1988 routine procedures involved locating a largenumber of events and assigning magnitude only to the largest. After 1988 a decrease in the location of small events and a significantincrease in the number of magnitude determinations were noted. The minimum magnitude of completeness for the period 1988-1998 is Md = 4.3. A comparison of the frequency-magnitude distributions for mb (PDE) and Md (SSN) indicates that mb magnitudesare basically equivalent to Md for the range M d___ 5.0. These results are important in that they show that when using statistics whichdo not take into consideration the period of reporting, serious biases could be introduced. Conversely, our results provide means tocorrect for the unhomogeneity of the catalog. In terms of the most significant seismicity variations in both space and time whichcould be due to natural causes we found several cases that need to be studied individually. 2000 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56839202 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.2 Vol.39 |
| format | Artículo científico |
| id | redalyc_56839202 |
| institution | Redalyc |
| language | en |
| publishDate | 2000 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | A general overview of the catalog of recent seismicity compiled by the Mexican Seismological Survey F. Ramón Zúñiga Ciencias de la Tierra Mexico catalog Seismicity natural changes artificial changes A general overview of the catalog of recent seismicity compiled by the Mexican Seismological Survey F. Ramón Zúñiga Carlos Valdés Marco A. Reyes Ciencias de la Tierra Mexico catalog Seismicity natural changes artificial changes We have analyzed the catalog of recent (1974-1998) seismicity in Mexico, based on the automatically compiled reports ofthe Servicio Sismológico Nacional (Mexican Seismological Survey). To this end, we employed various tools developed for theanalysis of seismic catalogs as well as for detailed studies of seismicity characteristics. Such tools comprise both newly developedtechniques and traditional methods which deal with the subject of artificial and natural variations of seismicity. We found that thetime characteristics of reporting suffered a drastic change during 1988. Before 1988 routine procedures involved locating a largenumber of events and assigning magnitude only to the largest. After 1988 a decrease in the location of small events and a significantincrease in the number of magnitude determinations were noted. The minimum magnitude of completeness for the period 1988-1998 is Md = 4.3. A comparison of the frequency-magnitude distributions for mb (PDE) and Md (SSN) indicates that mb magnitudesare basically equivalent to Md for the range M d___ 5.0. These results are important in that they show that when using statistics whichdo not take into consideration the period of reporting, serious biases could be introduced. Conversely, our results provide means tocorrect for the unhomogeneity of the catalog. In terms of the most significant seismicity variations in both space and time whichcould be due to natural causes we found several cases that need to be studied individually. 2000 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56839202 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.2 Vol.39 |
| title | A general overview of the catalog of recent seismicity compiled by the Mexican Seismological Survey |
| topic | Ciencias de la Tierra Mexico catalog Seismicity natural changes artificial changes |
| url | https://www.redalyc.org/articulo.oa?id=56839202 |