Virgin Island Earthquake History
Posted by Don In Hollister on October 22, 2001 at 20:21:03:

Hi All. It seems the area of Virgin Islands is still rocking. It could be the results of the latest geomagnetic storm, or it could be the results of the large quake a couple of days ago.

The quake histories for the Virgin Islands per say is quite impressive to say the least. Lowell’s partner in crime Pat is most likely very interested in this area. This is because of the tsunamis that have occurred in this area.

The Virgin Islands is classified as Zone Three in terms of earthquake hazard susceptibility the same as most earthquake-prone areas of California.

Four strong earthquakes have affected Puerto Rico since the beginning of its colonization. The most recent of these occurred on October 11, 1918. The epicenter was located northwest of Aguadilla in the Mona Canyon (between Puerto Rico and the Dominican Republic). This earthquake had an approximate magnitude of 7.5 on the Richter scale and was accompanied by a tsunami ("tidal" wave), which got up to 6 meters (19.5 feet) high.

On November 18, 1867, 20 days after Hurricane San Narciso devastated the Island, a strong earthquake occurred with an approximate magnitude of 7.5 on the Richter scale. The epicenter was located in the Anegada Passage, between Puerto Rico and St. Croix, Virgin Islands. The earthquake produced a tsunami that ran inland almost 150 meters (490 feet) in the low parts of the coast of Yabucoa.

Possibly the strongest earthquake that has affected Puerto Rico since the beginning of colonization occurred on May 2, 1787. This was felt strongly throughout the Island and may have been as large as magnitude 8.0 on the Richter scale. Its epicenter was possibly to the north, in the Puerto Rico Trench. The quake was felt very strongly all across the Island

The other strong earthquake, whose magnitude has not been determined, occurred in 1670, significantly affecting the area of San German District.

The suggested Island Earthquake Recurrence Period Scale

Probability Scale VIII Quake 20-year period.

St. Croix
133-275 years 40-60%
St. John
110-200 years 50-70%
St. Thomas
110-200 years 50-70%

Probability Scale VIII Quake 50-year period.

St. Croix
133-275 years 55-75%
St. John
110-200 years 60-80%
St. Thomas
110-200 years 60-80%

At any rate the area could be in for an interesting period the next couple of weeks. Take Care…Don in creepy town