دورية أكاديمية
Time-resolved seismic tomography detects magma intrusions at Mt. Etna
العنوان: | Time-resolved seismic tomography detects magma intrusions at Mt. Etna |
---|---|
المؤلفون: | Patanè, D., Barberi, G., Cocina, O., De Gori, P., Chiarabba, C. |
المساهمون: | Patanè, D., Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia, Barberi, G., Cocina, O., De Gori, P., Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia, Chiarabba, C., Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione OE, Catania, Italia, Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione ONT, Roma, Italia |
بيانات النشر: | American Association for the Advancement of Science |
سنة النشر: | 2006 |
المجموعة: | Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) |
مصطلحات موضوعية: | NONE, 04. Solid Earth::04.01. Earth Interior::04.01.02. Geological and geophysical evidences of deep processes, 04. Solid Earth::04.06. Seismology::04.06.07. Tomography and anisotropy, 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring |
الوصف: | The continuous volcanic and seismic activity at Mount Etna makes this volcano an important laboratory for seismological and geophysical studies. We used repeated three-dimensional tomography to detect variations in elastic parameters during different volcanic cycles, before and during the October 2002–January 2003 flank eruption. Well-defined anomalous low P- to S-wave velocity ratio volumes were revealed. Absent during the pre-eruptive period, the anomalies trace the intrusion of volatile-rich (Q4 weight percent) basaltic magma, most of which rose up only a few months before the onset of eruption. The observed time changes of velocity anomalies suggest that four-dimensional tomography provides a basis for more efficient volcano monitoring and shortand midterm eruption forecasting of explosive activity. ; Published ; 821-823 ; reserved |
نوع الوثيقة: | article in journal/newspaper |
وصف الملف: | 727523 bytes; application/pdf |
اللغة: | English |
العلاقة: | Science; /313 (2006); 1. B. R. Julian, A. M. Pitt, G. R. Foulger, Geophys. J. Int. 133, F7 (1998). 2. G. R. Foulger et al., J. Geophys. Res. 108, 10.1029/ 2000JB000041 (2003). 3. G. Guerin, W. He, R. N. Anderson, L. Xu, U. T. Mello, in 2000 Offshore Technology Conference, paper 12101, www.ces-enterprise.com/vpatch/bp/attachments/ OTC2000_Guerin.pdf. 4. R. O’Connell, B. Budiansky, J. Geophys. Res. 79, 5412 (1974). 5. N. I. Christensen, W. W. Wepfer, Geol. Soc. Am. Mem. 172, 91 (1989). 6. Z. W. Wang, A. Nur, Soc. Pet. Eng. Res. Eng. 3, 429 (1989). 7. J. Dvorkin, G. Mavko, A. Nur, Geophys. Res. Lett. 26, 3417 (1999). 8. G. Mavko, J. Geophys. Res. 85, 5173 (1980). 9. H. Sato, I. S. Sacks, T. Murase, J. Geophys. Res. 94, 5689 (1989). 10. C. O. Sanders, S. C. Ponko, L. D. Nixon, E. A. Schwartz, J. Geophys. Res. 100, 8311 (1995). 11. M. Coltelli, P. Del Carlo, L. Vezzoli, Int. J. Earth Sci. 89, 665 (2000). 12. R. Clocchiatti, M. Condomines, N. Guenot, J. C. Tanguy, Earth Planet. Sci. Lett. 226, 397 (2004). 13. N. Spilliaert, P. Allard, N. Me´ trich, A. V. Sobolev, J. Geophys. Res. 111, 10.1029/2005JB003934 (2006). 14. C. H. Thurber, in Seismic Tomography: Theory and Practice, H. M. Iyer, K. Hirahara, Eds. (Chapman and Hall, London, 1993), pp. 563–583. 15. D. Patane` , C. Chiarabba, P. De Gori, A. Bonaccorso, Science 299, 2061 (2003). 16. M. Laigle, A. Hirn, M. Sapin, J. C. Lepine, J. Geophys. Res. 105, 21,633 (2000). 17. C. Chiarabba, P. De Gori, D. Patane` , in Mt. Etna: Volcano Laboratory, A. Bonaccorso, S. Calvari, M. Coltelli, C. Del Negro, S. Falsaperla, Eds. (Geophysical Monograph Series, American Geophysical Union, Washington, DC, 2004), pp. 191–204. 18. For igneous rocks, laboratory experiments found that the VP /VS ratio generally decreases as temperature increases and increases as pressure increases. An increase in the VP /VS ratio is related to increases in temperature, fracture, and especially partial melt, whereas a decrease in the ratio can be associated with the presence of gas or supercritical fluids [see (10) and references therein]. 19. M. Aloisi, A. Bonaccorso, S. Gambino, M. Mattia, G. Puglisi, Geophys. Res. Lett. 30, 10.1029/ 2003GL018896 (2003). 20. D. Patane` , M. Mattia, M. Aloisi, Geophys. Res. Lett. 32, 10.1029/2004GL021773 (2005). 21. S. Gambino, A. Mostaccio, D. Patane` , L. Scarfı`, A. Ursino, Geophys. Res. Lett. 31, 10.1029/2004GL020499 (2004). 22. D. Andronico et al., Bull. Volcanol. 67, 10.1007/s00445- 004-0372-8 (2005). 23. C. Martı´nez-Arevalo, D. Patane` , A. Rietbrock, J. Ibanez, Geophys. Res. Lett. 32, 10.1029/2005GL023736 (2005). 24. Theory predicts that the velocity decreases and VP /VS increases for increasing crack density (4). High VP /VS values affecting portions of fault zones, such as at the San Andreas Fault, are interpreted as evidence for the presence of overpressured fluids (25). The influence of pore pressure on seismic velocities is caused by the tendency of cracks to remain open when they are internally pressurized (26). Thus, fracturing and increasing pore pressure cause a relatively marked decrease of VS but only a small decrease of VP, which yields an increased VP/VS ratio. The concentration of fluids in a dike intrusion mainly occurs near its tip. Moreover, a rapid migration of fluids in the surrounding rock volume can also occur, especially when prefractured zones exist, leading to a high VP/VS ratio and to an increase of the seismicity (Figs. 2 and 4C). 25. C. H. Thurber et al., Geophys. Res. Lett. 24, 1591 (1997). 26. A. Nur, Bull. Seismol. Soc. Am. 62, 1217 (1972). 27. A. Michelini, T. V. McEvilly, Bull. Seismol. Soc. Am. 81, 524 (1991). 28. M. Reyners, D. Eberhart-Phillips, G. Stuart, Geophys. J. Int. 137, 873 (1999). 29. We thank T. Caltabiano for SO2 flux data and anonymous referees for helpful comments and suggestions on the manuscript. This work was supported by grants from the European Union VOLUME FP6-2004-Global-3 and INGV– Department of Civil Protection V3/6 projects.; http://hdl.handle.net/2122/2197Test; www.sciencemag.org/cgi/content/full/313/5788/821/DC1 |
DOI: | 10.1126/science.1127724 |
الإتاحة: | https://doi.org/10.1126/science.1127724Test https://doi.org/10.1029/2005JB003934Test http://hdl.handle.net/2122/2197Test |
حقوق: | restricted |
رقم الانضمام: | edsbas.F32D98D8 |
قاعدة البيانات: | BASE |
DOI: | 10.1126/science.1127724 |
---|