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The Global Volcanism Program has no activity reports for Asuncion.
The Global Volcanism Program has no Weekly Reports available for Asuncion.
Reports are organized chronologically and indexed below by Month/Year (Publication Volume:Number), and include a one-line summary. Click on the index link or scroll down to read the reports.
6/1992 (BGVN 17:06) Strong steaming
6/1992 (BGVN 17:06) Strong steaming
A six-member team of USGS volcanologists visited the Commonwealth of the Northern Mariana Islands 11-27 May 1992 at the request of the CNMI Office of Civil Defense. Vigorous steaming was occurring from several locations in the summit crater [of Asuncion] during observations from a helicopter on 18 May.
Information Contacts: R. Moore, USGS; R. Koyanagi, M. Sako, and F. Trusdell, HVO.
A single large asymmetrical stratovolcano, steeper on the NE side, forms 3-km-wide Asuncion Island. The steep NE flank of the 857-m-high volcano terminates in high sea cliffs. The gentler SW flanks have low-angle slopes bounded by sea cliffs only a few meters high. The southern flank of the volcano is cut by a large landslide scar. The southern flanks and western flanks of the volcano are mantled by ash deposits that may have originated during eruptions in historical time. An explosive eruption in 1906 also produced lava flows that descended about half way down the western and SE flanks, but several other historical eruption reports are of uncertain validity.
Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).
|Start Date||Stop Date||Eruption Certainty||VEI||Evidence||Activity Area or Unit|
|[ 1924 ]||[ Unknown ]||Uncertain||2|
|1906||Unknown||Confirmed||2||Historical Observations||Upper SE and west flanks|
|[ 1901 ]||[ Unknown ]||Discredited|
|[ 1819 ]||[ Unknown ]||Discredited|
|[ 1786 ]||[ Unknown ]||Discredited|
|[ 1775 ± 10 years ]||[ Unknown ]||Uncertain||2|
|[ 1690 ± 10 years ]||[ Unknown ]||Uncertain|
This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.
|An aerial view from the SW shows the unvegetated upper slopes of 857-m-high Asuncion volcano in the northern Mariana Islands. The large asymmetrical stratovolcano forms a circular 3-km-wide island that has had no permanent residents since the late-17th century. An explosive eruption in 1906 produced lava flows that descended about half way down the western and SE flanks, but several other historical eruption reports are of uncertain validity.
Photo by Dick Moore, 1992 (U.S. Geological Survey).
The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title.
Bloomer S H, Stern R J, Smoot N C, 1989. Physical volcanology of the submarine Mariana and Volcano arcs. Bull Volc, 51: 210-224.
Corwin G, 1971. Quaternary volcanics of the Mariana Islands. Unpublished manuscript, 137 p.
Katsui Y (ed), 1971. List of the World Active Volcanoes. Volc Soc Japan draft ms, (limited circulation), 160 p.
Kuno H, 1962. Japan, Taiwan and Marianas. Catalog of Active Volcanoes of the World and Solfatara Fields, Rome: IAVCEI, 11: 1-332.