August 9, 1827 Earthquake: Kamchatka, Russia

From July 27 to 29 [Aug 9 to 11 new style], 1827, there was a very intense eruption of the Avacha volcano, which was described first in the newspapers and later in more detail by participants in the Lutke expedition, who had been in Petropavlovsk within six weeks after the eruption.

In the accounts it is noted that the eruption began after several subterranean shocks on July 27 [Aug 9]. At 3 o'clock in the afternoon on the 28th [Aug 10] "unusually strong shocks were heard, like heavy thunder." "The earthquake was reported with no less force" on the 29th [Aug 11] at 8 o'clock in the morning, after which occurred the main explosion of the volcano.

As a result of the shocks "in many log cabins in the village of Avacha glass was broken and timbers were shifted."

Furthermore, "the fishermen affirmed that the sea ran far out in the bay; it is not stated whether this was on the 28th or the 29th [Aug 10 or Aug 11].

The material presented permits us to assume that at the time of the eruption of the Avancha volcano a strong tectonic earthquake occurred, apparently accompanied by a tsunami.

It is withinthe bounds of possibility that the earthquake of June at Avacha and that of July in the Komandorsky Islands were one and the same. Actually F.P. Lutke described the Komandorsky earthquake on the basis of material from the archives of the Russian-American Company and could easily have mistakenly indicated June in place of July.

(above from reference #413)