1952 Severo-Kurilsk earthquake

Tectonic setting

The earthquake occurred off the Kamchatka Peninsula's east coast, which runs parallel to the Kuril-Kamchatka Trench, the area where the Pacific and Okhotsk Sea plates converge. Being older and therefore denser, the Pacific subducts beneath the Kamchatka Peninsula, which sits on the Okhotsk Sea plate. These two plates meet along a convergent boundary, marked by the trench. The subduction zone is seismogenic and produces Kamchatka earthquakes, which occasionally generate tsunamis. Earthquakes associated with the Kuril-Kamchatka subduction zone are of the megathrust type. The subduction zone is associated with at least two known ~9.0 earthquakes in the pre-instrumental period; 1737 and 1841. The 1737 earthquake measured 9.0–9.3, and generated the largest known tsunami (60 meters) on the peninsula. Another 9.0 earthquake struck the peninsula on May 17, 1841. It generated a tsunami up to 15 meters high and was felt with a maximum intensity of VIII–IX.

Earthquake

Estimates of the moment magnitude range from () 8.8 to 9.0. The earthquake ruptured a patch of the subduction zone which extends from the northern portion of Onekotan to Cape Shipunskii; approximately 700 km long. The rupture width is estimated at 150–200 km. Slip on the rupture patch occurred in a direction perpendicular to the Kuril-Kamchatka Trench. Unlike most large subduction earthquakes, the greatest fault movement in the 1952 event occurred at deeper depth instead of being closer to the trench. Movement on the fault was inferred to be as deep as 40 km and possibly 60–80 km. Little slip occurred at the trench, leaving it locked and accumulating unreleased elastic energy.

Two years prior to the mainshock, a sequence of foreshocks commenced near the epicenter location, as well as the southern edge of the rupture. The aftershock sequence one month after the mainshock was used to define the northern extent of slip.

Tsunami

A tsunami was generated 130 km off of Kamchatka, striking Severo-Kurilsk with three waves about 15 - high.

After the earthquake the majority of the Severo-Kurilsk citizens fled to the surrounding hills, where they escaped the first wave. However, most of them returned to the town and were killed by the second wave. The true number of deaths may have been calculated by authorities, but hidden by late Stalinist censorship. The common estimates vary widely at between 2,336 and 14,000.

Severo-Kurilsk was then rebuilt on higher location farther inland, with only the port remaining on the seashore.

Hawaii property damage

Economic damage in Hawaii came from the tsunami waves, where property damage was between $800,000 and $1,000,000 USD in 1952 dollars. The waves caused a cement barge to fly into a freighter in Honolulu harbor. In Hilo, an expensive boathouse was destroyed. A small portion of the bridge connecting Hilo to nearby Coconut Island was damaged from the strong waves along with houses in the area being stripped from their foundations. Coast guard buoys were torn from their anchors.

References

Sources

References

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