I believe you'll find today's earthquake history much more interesting
than other days in regard to recurring earthquakes. While
Parkfield, California is well known for repeating sequences; it is not
the only place in the world which enjoys the same. While I would love to take credit for this entire report, I must confess a friend of mine who is a scientist who works on earthquake catalogs is teaching me how to acquire the skills necessary to be proficient in gathering data from many sources..Petra

TODAY IN EARTHQUAKE HISTORY

The largest earthquake recorded on February 27 was a Mw 8.0 in the
northern Kermadec Islands, N.Z. in 1955. This earthquake is part of
a long and possibly interesting pattern of repeating earthquakes.
Starting in 1932 the largest shallow earthquakes in the northern Kermadec
Islands have generally occurred at approximately 11-year intervals
(11.1 years +/- about 5 months) with the exception of the period between
Feb 27, 1955 and Jan 14, 1976. The largest earthquakes near 28-29S
175-178W have occurred as follows with the recurring times between
events as indicated:

Event Date Magnitude Recurring Period

May 26, 1932 Ms 7.8

Sept 14, 1943 Ms 7.6 11 years 4 months

Feb 27, 1955 Ms 8.0 11 years 4 months

Jan 14, 1976 Ms 8.1 20 years 11 months

Oct 20, 1986 Ms 8.9 10 years 9 months

Sept 20, 1997 Ms 7.3 10 years 11 months

There was one exception on Sept. 14, 1959 of an Ms 7.8 that occurred only
4.6 years after the previous large earthquake in the region.

WHEN WILL THE NEXT QUAKE OCCUR ???

U.S./CANADA

The largest event to occur in the U.S./Canada region on Feb. 27 was
a Ms 6.8 earthquake in the Fox Islands region of the Aleutians, Alaska
in 1987. This earthquake produced minor damage at Dutch Harbor and Unalaska.
A similar but smaller event had occurred at the same epicenter with
Ms 6.1 twenty-six years earlier on Feb. 27, 1961.

HISTORICAL REPETITION: 10 Yr Coincidence

The only other earthquakes of Mb>=6 to occur in the U.S./Canada region struck the western Andreanoff Islands (Aleutians) at nearly the same epicenter in 1960 (Ms 6.0) and again
exactly 10 years to the day later on Feb 27, 1970 (Ms 6.0). These two
earthquakes were not exactly 10 years apart, however, as the first occurred
at 08:10UT and the second an hour earlier at 07:07UT.

CLOSER TO HOME:

02/27/37 5.0 Baja
02/27/65 5.7 Baja
02/27/71 5.4 Northern California

GLOBAL:

The following events of Mw>=7 have occurred on this date in recorded history:

MO DA HR MN SC YEAR LATIT LONGIT DEP MW LOCATION

2 27 0 43 18 1903 -8.000 106.000 60 8.1 24

South of Java. Felt over Banten. Small cracks were observed in walls.

2 27 20 20 36 1916 12.000 -90.000 60 7.6 6

Near the coast of El Salvador.

2 27 18 23 34 1921 -18.500 -173.000 60 7.2 12
2 27 20 43 23 1955 -28.250 -175.000 0 8.0 0

Felt with intensity VII at Raoul Island.

2 27 8 31 58 1987 53.500 -167.400 25 7.2 0

The largest event to occur in the U.S./Canada region on Feb. 27 was
this Ms 7.2 earthquake in the Fox Islands region of the Aleutians, Alaska
in 1987. This earthquake produced minor damage at Dutch Harbor and Unalaska.
Maximum intensity V at Akutan.

2 27 21 8 2 1997 29.976 68.208 33 7.3 362

At least 57 were killed and hundreds injured. Thousands were left homeless
in Pakistan. More than 500 houses were damaged or destroyed and many domestic
animals were killed. Landslides blocked roads and railroads. Felt throughout
Pakistan and Baluchistan.

U.S.REGION

Following are events of Mb>=5 which have occurred in this region on this date.

MO DA HR MN SC YEAR LATIT LONGIT DEP MW LOCATION

2 27 1 29 18 1937 31.866 -116.566 10 5.0 0

Off the coast of Lower California. Felt at El Centro and Mission Hills in
San Diego.

2 27 22 19 52 1959 38.000 -112.500 0 5.0 6

Felt with intensity VI over about 1500 sq. miles of southwestern Utah.
Maximum intensity occurred at Panguitch where plaster cracked and dishes broke. Many
were frightened. Loud earthquake noises were heard. Felt also at Bear Valley Junction.
Felt with minor damage at Antimony, Greenville and Hatch.

2 27 8 10 3 1960 51.500 -178.000 33 6.1 0

Felt at Adak.

2 27 13 6 30 1961 52.580 -169.030 0 6.1 0
2 27 23 36 23 1963 55.200 -162.000 0 5.2 0
2 27 7 46 29 1965 28.500 -112.100 33 5.7 108
2 27 20 43 0 1966 54.000 -164.000 37 5.0 30
2 27 7 7 56 1970 50.130 -179.590 7 6.0 327

Felt with intensity III on Amchitka Island.

2 27 7 17 51 1970 50.130 -179.780 21 5.0 52
2 27 0 31 40 1971 40.338 -124.526 3 5.4 141

Felt strongest at Eureka, Fort Bragg and McKinleyville. Damage was
limited to cracked windows at Ferndale and sheetrock cracked at Honeydew.

2 27 3 42 1 1974 43.870 -128.429 15 5.0 96
2 27 3 43 20 1974 43.741 -128.574 43 5.0 57
2 27 12 18 7 1982 62.336 -147.923 71 5.0 131

Felt with intensity III at Fairbanks. Also felt at Anchorage and Palmer.

2 27 15 55 33 1983 55.072 -158.999 36 5.0 42
2 27 20 40 31 1983 50.725 -129.928 10 5.0 116
2 27 8 31 54 1987 53.442 -167.288 10 6.7 653

The largest event to occur in the U.S. Region on Feb. 27 was
this Ms 6.7 earthquake in the Fox Islands region of the Aleutians, Alaska
in 1987. This earthquake produced minor damage at Dutch Harbor and Unalaska.
Maximum intensity V at Akutan.

2 27 12 33 5 1990 51.640 -175.410 46 5.0 0
2 27 21 49 56 1990 52.013 -166.897 33 5.3 155
2 27 2 22 15 2000 60.292 -146.072 33 5.2 268

Felt at Cordova and Glennallen.