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SEISMO-ACUSTIC SIGNALS FROM TWO ERUPTING VOLCANOES IN ECUADOR: POTENTIAL FOR MORE RESEARCH 2001 INFRASOUND TECHNOLOGY W

SEISMO-ACUSTIC SIGNALS FROM TWO ERUPTING VOLCANOES IN ECUADOR: POTENTIAL FOR MORE RESEARCH 2001 INFRASOUND TECHNOLOGY WORKSHOP KAILUA-KONA , HAWAII. HUGO YEPES A and MARIO RUIZ R. INSTITUTO GEOFISICO, ESCUELA POLITECNICA NACIONAL QUITO, ECUADOR 14 November 2001 Hayepes@hotmail.com

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SEISMO-ACUSTIC SIGNALS FROM TWO ERUPTING VOLCANOES IN ECUADOR: POTENTIAL FOR MORE RESEARCH 2001 INFRASOUND TECHNOLOGY W

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  1. SEISMO-ACUSTIC SIGNALS FROM TWO ERUPTING VOLCANOESIN ECUADOR:POTENTIAL FOR MORE RESEARCH2001 INFRASOUND TECHNOLOGY WORKSHOPKAILUA-KONA,HAWAII HUGO YEPES A and MARIO RUIZ R. INSTITUTO GEOFISICO, ESCUELA POLITECNICA NACIONAL QUITO, ECUADOR 14 November 2001 Hayepes@hotmail.com http://www.epn.edu.ec/~igeo

  2. OUTLINE • LEID MOTIV • SOURCE • ACQUISITION SYSTEMS • SEISMO-ACOUSTIC SIGNALS • WHAT WE HAVE LEARNED • OPORTUNITIES

  3. QUATERNARY VOLCANOES AND POPULATION

  4. GUAGUA PICHINCHA

  5. SOURCE MECHANISM

  6. MONTHLY NUMBER OF EXPLOSIONS GGP

  7. Inicio actividad magmática

  8. Erupción del 7 de Octubre de 1999

  9. 07-10-99

  10. 2 07-10-99

  11. 07-10-99

  12. TUNGURAHUA

  13. WEEKLY NUMBER OF EXPLOSIONS

  14. 23 NOV 1999

  15. ACQUISITION SYSTEMS • 4 electret condenser microphones 12 km from the crater 1 m apart single recorders, stacked signals • STS2 BB seismometer • 8 1 Hz vertical component seismic network

  16. ACQUISITION SYSTEMS Red sismica Red de deformación Muestras de agua

  17. INFRASOUND SIGNALS03-NOVIEMBRE-1999

  18. 1 Hz Vert. SIGNALS 5 OCT. and 25 NOV. 1999

  19. BB SIGNALS 11 NOV. 1999 Waveforms in vertical and E-W (transversal) component of explosion type seismic signal recorded in RUN4 Seismic Station located 9 km north the active crater. Acoustic signal arrives 27 sec later the onset of P waves. Spectra plots contain the seismic and acoustic part of vertical component.

  20. DEPTH DETERMITATION

  21. CALCULO DE LA VELOCIDAD DE ONDAS ACUSTICAS

  22. CALCULATIONS • tac(aire)=daire/vac(aire)=4.636 km/0.325 km/s=14.265 s • tsis(suelo)=2.413 s • (1)tac(obs) = to + tac(aire) + tac(cond) • (2)tsis(obs) = to + tsis(suelo) •  (1)-(2): • tac(obs) – tsis(obs)= tac(aire) + tac(cond) - tsis(suelo) = 13.289 (s) • tac(cond) = 1.437 s • Si Vac(cond)= 0.1 km/s hasta 0.4 km/s (Chouet et al., 1998): • D(cond)= Vac(cond) . tac(cond) • Dmin = 144 m • Dmax = 575 m

  23. EXPLOSION RELATED GROUND DEFORMATION

  24. ENERGY

  25. CONCLUSIONS • GOOD POTENTIAL TO USE VOLCANIC EXPLOSIONS AS KNOWN INFRASOUND SOURCES FOR DETECTION SYSTEM DEVELOPMENTS • VARIABILITY OF LOCAL WIND VELOCITY STRUCTURE • POSSIBILITIES FOR GOOD COOPERATION

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