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The Global Volcanism Program has no activity reports for Qal'eh Hasan Ali.
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The Qal'eh Hasan Ali volcanic field in SE Iran contains 14 maars of late Quaternary age. The maars were erupted through desert alluvium, granodioritic rocks, and Eocene volcanics in an area several hundred km away from the closest Quaternary volcanoes. The maars produced tephritic pyroclastic deposits. The diameters of the maars range from 150 to 1200 m; the largest, known as Great Crater, is 1.2 km wide and 200-300 m deep. The ages of the maars have been roughly estimated by degree of erosion as 5000-50,000 years (Milton, 1976-77).
The Global Volcanism Program is not aware of any Holocene eruptions from Qal'eh Hasan Ali. If this volcano has had large eruptions (VEI >= 4) prior to 10,000 years ago, information might be found on the Qal'eh Hasan Ali page in the LaMEVE (Large Magnitude Explosive Volcanic Eruptions) database, a part of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).
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.
|Feature Name||Feature Type||Elevation||Latitude||Longitude|
|Great Crater||Maar||29° 24' 0" N||57° 34' 0" E|
|The circular crater near the center of this NASA Landsat image (with north to the top) is the largest maar of the Qal'eh Hasan Ali volcanic field in SE Iran. This maar, known as "Great Crater, " is 1.2 km wide and 200-300 m deep. It is one of 14 maars of late Quaternary age erupted through desert alluvium, granodioritic rocks, and Eocene volcanics in an area several hundred km away from the closest Quaternary volcanoes.
NASA Landsat7 image (worldwind.arc.nasa.gov)
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.
Milton D J, 1976-77. Qal'eh Hasan Ali maars, Central Iran. Bull Volc, 40: 201-208.