| 21. | There are no young lava flows on the flanks and the summit crater is degraded.
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| 22. | It has two summit craters and a pyroclastic cone.
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| 23. | Steam from the summit crater lake and ash on the flank was reported in 1962.
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| 24. | The cone was around 450 Metres wide with a summit crater 200 m in diameter.
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| 25. | The volcano is topped by a wide summit crater which is breached to the east.
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| 26. | The most recent lava flow was erupted from the summit crater and flowed to the west.
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| 27. | The volcano has a well formed summit crater.
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| 28. | The summit crater was covered in snow but estimated to be between in diameter and deep.
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| 29. | It has steep upper slopes that average 35 40?and is capped by a small summit crater.
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| 30. | Olca is comprised by a base overlain by early lava flows, and has a visible summit crater.
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