Spatial and temporal magnetic anomalies of Colima volcano, western Mexico
Fuente:
Redalyc
Gespeichert in:
| 1. Verfasser: | |
|---|---|
| Format: | Artículo científico |
| Sprache: | en |
| Veröffentlicht: |
Universidad Nacional Autónoma de México
1999
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1876447456360660992 |
|---|---|
| author | Héctor López Loera |
| author_facet | Héctor López Loera |
| contents | Spatial and temporal magnetic anomalies of Colima volcano, western Mexico Héctor López Loera Jaime Urrutia Fucugauchi Ciencias de la Tierra dome thermal state Colima volcano western Mexico Magnetic anomalies Colima volcano has erupted frequently in historic times. Present activity includes the episodic growth of a lava dome withinthe summit crater. Total magnetic field at stations spaced every 0.5 km along a 35 km long transect was measured across theeastern flank and the summit, between Atenquique and El Playón, from April 27, 1995 to May 16, 1996. Three distinct sectorswere recognized. (1) The Nevado de Colima debris avalanche and volcanic conglomerates of the Atenquique Formation, betweenstations 10 and 23 km, characterized by low-amplitude, low-frequency anomalies and no temporal changes. (2) Andesitic lavasand breccias between stations 23 and 35 km, characterized by low-frequency anomalies with superimposed high-frequency anomaliesof varying amplitude, and low-amplitude temporal changes. (3) Between stations 35 and 45 km, characterized by low-frequency,high-amplitude anomalies and large-amplitude temporal variations, across the summit and avalanche caldera, in andesitic lavasand breccias. Modeling indicates that source bodies may extend several hundred meters deep, depending on the variation ofmagnetic properties with depth. Temporal variations in the magnetization within the volcano may be caused by temperaturechanges. Magnetization/demagnetization beneath the summit may be associated with the eruptive activity. Potential mechanismsfor heating/cooling processes may include magma movement, an active hydrothermal system with strong fumarolic activity andgroundwater interactions. A 1500-2500 nT composite magnetic low was found at the present cone summit and the avalanchecaldera. Temporal changes superimposed over the high-amplitude, low-frequency magnetic anomalies, are associated with theongoing volcanic activity. 1999 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56838101 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.1 Vol.38 |
| format | Artículo científico |
| id | redalyc_56838101 |
| institution | Redalyc |
| language | en |
| publishDate | 1999 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Spatial and temporal magnetic anomalies of Colima volcano, western Mexico Héctor López Loera Ciencias de la Tierra dome thermal state Colima volcano western Mexico Magnetic anomalies Spatial and temporal magnetic anomalies of Colima volcano, western Mexico Héctor López Loera Jaime Urrutia Fucugauchi Ciencias de la Tierra dome thermal state Colima volcano western Mexico Magnetic anomalies Colima volcano has erupted frequently in historic times. Present activity includes the episodic growth of a lava dome withinthe summit crater. Total magnetic field at stations spaced every 0.5 km along a 35 km long transect was measured across theeastern flank and the summit, between Atenquique and El Playón, from April 27, 1995 to May 16, 1996. Three distinct sectorswere recognized. (1) The Nevado de Colima debris avalanche and volcanic conglomerates of the Atenquique Formation, betweenstations 10 and 23 km, characterized by low-amplitude, low-frequency anomalies and no temporal changes. (2) Andesitic lavasand breccias between stations 23 and 35 km, characterized by low-frequency anomalies with superimposed high-frequency anomaliesof varying amplitude, and low-amplitude temporal changes. (3) Between stations 35 and 45 km, characterized by low-frequency,high-amplitude anomalies and large-amplitude temporal variations, across the summit and avalanche caldera, in andesitic lavasand breccias. Modeling indicates that source bodies may extend several hundred meters deep, depending on the variation ofmagnetic properties with depth. Temporal variations in the magnetization within the volcano may be caused by temperaturechanges. Magnetization/demagnetization beneath the summit may be associated with the eruptive activity. Potential mechanismsfor heating/cooling processes may include magma movement, an active hydrothermal system with strong fumarolic activity andgroundwater interactions. A 1500-2500 nT composite magnetic low was found at the present cone summit and the avalanchecaldera. Temporal changes superimposed over the high-amplitude, low-frequency magnetic anomalies, are associated with theongoing volcanic activity. 1999 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56838101 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.1 Vol.38 |
| title | Spatial and temporal magnetic anomalies of Colima volcano, western Mexico |
| topic | Ciencias de la Tierra dome thermal state Colima volcano western Mexico Magnetic anomalies |
| url | https://www.redalyc.org/articulo.oa?id=56838101 |