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PITON DE LA FOURNAISE

PITON DE LA FOURNAISE. Manzoni Patrick. Country : France Subregion Name : Western Indian Ocean Volcano Type : Shield volcano Volcano Status: Historical Last Known Eruption : 2010  Summit Elevation : 2632 m8,635 feet Latitude : 21.231°S 21°13'51"S Longitude : 55.713°E55°42'45"E.

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PITON DE LA FOURNAISE

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  1. PITON DE LA FOURNAISE Manzoni Patrick Country: France SubregionName: Western IndianOcean Volcano Type: Shieldvolcano Volcano Status:Historical Last KnownEruption:2010  Summit Elevation:2632 m8,635 feet Latitude:21.231°S 21°13'51"S Longitude:55.713°E55°42'45"E 9/13/2010

  2. Eruptivecharacteristic: • Centralventeruption • Radialfissureeruption • Explosiveeruption • Lava flows • DebrisAvalanche • Lava lakeeruption • Flank (excentric) vent • Phreaticexplosion

  3. DURATIONS OF HISTORICAL ERUPTIONS • WE CAN SAY, HOWEVER THAT FOR THIS PERIOD, THE DURATION OF ERUPTIONS IS GENERALLY SHORT • 92 ERUPTIONS TAKE PLACE WITH DURATION LESS OF 1 YEAR.

  4. DURATIONS OF HISTORICAL ERUPTIONS • POSSIBLE CYCLE OF ERUPTION DURATION, WITH 3 PEAKS: • 1640 • 1830 • 1985 • TIME INTERVAL OF 150 YEARS

  5. ERUPTIVE CYCLES AND VOLUMES OF MAGMA EMITTED • WE CAN DISTINGUISH 3 MAJOR CYCLES FOR THE LAST 70 YEARS: • 1931 WITH 0,05 m3/s OF MEAN OUTPUT • 1985 WITH 0,1 m3/s OF MEAN OUTPUT • 2006 WITH 1,3 m3/S OF MEAN OUTPUT

  6. RELATION BETWEEN DURATIONS OF ERUPTIONS AND PERIODS OF INACTIVITY • THE DURATION OF AN ERUPTIONS HAS A DIRECT INFLUENCE ON THE DURATION OF THE FOLLOWING PERIODS OF INACTIVITY • <6 MONTHS < 1 YEARS • >6 MONTHS > 1 YEARS • THE PERIOD OF INACTIVITY DECREASE TOWARDS THE PRESENT EPOCH • MORE FREQUENT ERUPTION

  7. INACTIVITY PERIODS • THERE’S A DOWNWARD TREND OF THE REPOSE TIME • AGREE WITH THE INCREASED FREQUENCY OF ERUPTION • AGREE WITH THE AVERAGE VALUES OF PREVIOUS SLIDE

  8. VOLCANIC EXPLOSIVITY INDEX • WE CAN NOTE, OVER THE YEARS, THE PREDOMINANT VALUE OF “VEI” IS 2 • PROBABLE ERUPTION CYCLE..? • DOWNWARD TREND OF VOLCANIC EXPLOSIVITY INDEX

  9. CONCLUSION: FORECASTING VOLCANIC ERUPTIONS • WE CAN DISTINGUISH THREE MAJOR VOLCANIC CYCLES DURING LAST 70 YEARS. THE THIRD IS STILL IN PROGRESS. • EACH CYCLE BEGAN WITH A HUGE OUTPOURING OF OCEANITE MAGMA. • THE DURATION OF AN INACTIVE PERIOD IS LINKED WITH THE DURATION OF PREVIOUS ERUPTION (AND MAYBE WITH THE VOLUME OF MAGMA EMITTED DURING PREVIOUS ERUPTION). • WE CAN DISTINGUISH ONE MAJOR VOLCANIC CYCLE OF DURATION IN THE LAST 370 YEARS. • A FUTURE FORECAST NEED ADDITIONAL DATA, SEISMIC DATA, INSTRUMENTS FOR MONITORING OF GAS EMISSION, ECC.

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