Report on Soufriere Guadeloupe (France) — June 1977

Natural Science Event Bulletin, vol. 2, no. 6 (June 1977)
Managing Editor: David Squires.

Soufriere Guadeloupe (France) Summary of seismicity since mid-1975

Please cite this report as:

Global Volcanism Program, 1977. Report on Soufriere Guadeloupe (France). In: Squires, D (ed.), Natural Science Event Bulletin, 2:6. Smithsonian Institution. http://dx.doi.org/10.5479/si.GVP.NSEB197706-360060.

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Soufriere Guadeloupe

France

16.044°N, 61.664°W; summit elev. 1467 m

All times are local (unless otherwise noted)


Table 6 summarizes seismicity at Soufrière from mid-1975 through May 1976.

Table 6. Total seismic energy release (x 1013 ergs) per 1/3-month period, July 1975-May 1977. Courtesy of M. Feuillard.

[Skip text table]
    Days of Month   01-10   11-20   21-end of month

    Jul 1975           0        0            23
    Aug                0        0             0
    Sep                0        0             0
    Oct                0        0             1
    Nov                0        1            91
    Dec                0        0            14
    Jan 1976           0        0             1
    Feb                1        7             5
    Mar                1      100         18000
    Apr              175       26           125
    May               35      150          4600
    Jun              380       88            64
    Jul               80      510           768
    Aug             1544    33831         20010
    Sep             1027      469           949
    Oct              446      532           930
    Nov              523      402           168
    Dec              225      165            41
    Jan 1977          76       71           154
    Feb              152       38            33
    Mar                4       54            52
    Apr                2        7             1
    May                1        2             6

Further References. Feuillard, M., Allegre, C.J., Brandeis, G., Gaulon, R., and others, 1983, The 1975-1977 crisis of La Soufrière de Guadeloupe (F.W.I.): A still-born magmatic eruption: JVGR, v. 16, p. 317-334.

Geologic Background. La Soufrière de la Guadeloupe volcano occupies the southern end of Basse-Terre, the western half of the butterfly-shaped island of Guadeloupe. Construction of the Grand Découverte volcano about 0.2 million years ago (Ma) was followed by caldera formation after a plinian eruption about 0.1 Ma, and then by construction of the Carmichaël volcano within the caldera. Two episodes of edifice collapse and associated large debris avalanches formed the Carmichaël and Amic craters about 11,500 and 3100 years ago, respectively. The presently active La Soufrière volcano subsequently grew within the Amic crater. The summit consists of a flat-topped lava dome, and several other domes occur on the southern flanks. Most historical eruptions have originated from NW-SE-trending fissure systems that cut across the summit and upper flanks. A relatively minor phreatic eruption in 1976-77 caused severe economic disruption when Basse-Terre, the island's capital city, which lies immediately below the volcano, was evacuated.

Information Contacts: M. Feuillard, Lab. de Physique du Globe.