Hi all;

Following John's suggestion below I found all the pairs of quakes that
happened within an hour of each other but 1000km or more away. Then I grouped
them by the main location to see if there was any consistency to the
second location.

1973 12 30 16 20 -15.320 -173.080 6.2 TONGA ISLANDS
1973 12 30 16 39 -15.510 166.640 6.6 2175.7 0 VANUATU ISLANDS

1978 3 3 10 48 -15.290 -173.520 6.2 TONGA ISLANDS
1978 3 3 10 52 55.100 164.760 6.2 8099.6 0 KOMANDORSKY ISLANDS REGION

1978 6 11 14 26 -15.260 -173.560 6.2 TONGA ISLANDS
1978 6 11 14 55 49.260 -129.500 6.1 8387.6 0 VANCOUVER ISLAND REGION

1990 4 6 14 30 -21.620 -174.210 6.4 TONGA ISLANDS
1990 4 6 14 57 15.180 147.600 6.2 5845.1 0 MARIANA ISLANDS REGION

2004 4 14 1 32 -17.850 -174.560 6.0 TONGA ISLANDS
2004 4 14 1 54 55.230 162.660 6.2 8416.1 0 NEAR EAST COAST OF KAMCHATKA

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1975 5 13 20 32 16.180 122.170 6.5 LUZON, PHILIPPINE ISLANDS
1975 5 13 21 18 1.020 126.060 6.3 1740.8 0 NORTHERN MOLUCCA SEA

1980 3 31 12 40 16.130 121.960 6.3 LUZON, PHILIPPINE ISLANDS
1980 3 31 13 3 -20.560 -173.800 6.2 8120.3 0 TONGA ISLANDS

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1978 6 14 11 33 38.320 142.360 6.3 NEAR EAST COAST OF HONSHU, JAPAN
1978 6 14 12 31 8.250 122.400 6.9 3900.6 0 MINDANAO, PHILIPPINE ISLANDS

1986 6 24 2 53 34.790 140.600 6.3 NEAR EAST COAST OF HONSHU, JAPAN
1986 6 24 3 11 -4.450 143.940 7.1 4382.4 0 NEW GUINEA, PAPUA NEW GUINEA

1991 9 3 8 44 33.650 138.780 6.4 SOUTH OF HONSHU, JAPAN
1991 9 3 9 4 -17.910 -116.000 6.0 12494.2 0 SOUTHERN EAST PACIFIC RISE

1995 2 23 5 1 39.750 143.660 6.2 OFF EAST COAST OF HONSHU, JAPAN
1995 2 23 5 19 24.140 121.610 6.2 2699.1 0 TAIWAN

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1983 4 4 23 12 49.410 155.600 6.5 KURIL ISLANDS
1983 4 4 23 57 -15.040 167.290 6.2 7266.7 0 VANUATU ISLANDS

1995 12 10 22 48 44.230 149.800 6.3 KURIL ISLANDS
1995 12 10 23 46 -21.510 -178.080 6.2 8016.6 0 FIJI ISLANDS REGION

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Missed these when grouping. They aren't associated and should be
down with the bottom bunch.

1984 1 19 16 14 -23.640 -178.320 6.4 SOUTH OF FIJI ISLANDS
1984 1 19 16 34 5.990 146.530 6.1 5045.7 0
E. CAROLINE ISLANDS, MICRONESIA

1988 7 23 14 24 -22.130 174.900 6.6 LOYALTY ISLANDS REGION
1988 7 23 15 17 -6.530 152.780 6.8 2943.1 0 NEW BRITAIN REGION, P.N.G.

1990 9 23 20 33 -6.730 130.370 6.5 BANDA SEA
1990 9 23 21 13 33.270 138.640 6.5 4538.0 0 SOUTH OF HONSHU, JAPAN

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1991 11 1 16 23 -30.250 -177.980 6.7 KERMADEC ISLANDS, NEW ZEALAND
1991 11 1 16 52 46.550 152.780 6.0 9041.7 0 KURIL ISLANDS

1994 12 28 22 23 -32.960 179.860 6.0 SOUTH OF KERMADEC ISLANDS
1994 12 28 22 36 40.380 143.640 6.4 8973.8 0
OFF EAST COAST OF HONSHU, JAPAN

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1995 10 29 18 44 .860 125.980 6.1 NORTHERN MOLUCCA SEA
1995 10 29 19 39 -21.790 -179.390 6.1 6442.2 0 FIJI ISLANDS REGION

1995 10 29 19 23 .860 125.890 6.1 NORTHERN MOLUCCA SEA
1995 10 29 19 39 -21.790 -179.390 6.1 6451.2 0 FIJI ISLANDS REGION

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1996 10 18 10 50 30.570 131.090 6.6 KYUSHU, JAPAN
1996 10 18 11 19 .390 126.220 6.3 3399.0 0 NORTHERN MOLUCCA SEA

1996 10 19 14 44 31.890 131.470 7.0 KYUSHU, JAPAN
1996 10 19 14 53 -20.410 -178.510 6.9 7894.0 0 FIJI ISLANDS REGION

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Unassociated leftovers.

1979 1 27 18 15 -18.540 168.210 6.3 VANUATU ISLANDS
1979 1 27 18 56 54.770 -161.250 6.0 8661.1 0 ALASKA PENINSULA

1992 2 17 4 36 -55.980 158.120 6.2 MACQUARIE ISLANDS REGION
1992 2 17 4 41 -21.650 170.410 6.2 3954.6 0 LOYALTY ISLANDS REGION

1995 2 23 5 19 24.140 121.610 6.2 TAIWAN
1995 2 23 5 26 39.790 143.570 6.1 2695.1 0
OFF EAST COAST OF HONSHU, JAPAN

1995 5 22 3 45 -22.800 170.010 6.3 LOYALTY ISLANDS REGION
1995 5 22 4 2 -9.660 151.510 6.1 2454.8 0 D'ENTRECASTEAUX ISLANDS REGION

2000 3 3 22 9 -7.320 128.490 6.4 BANDA SEA
2000 3 3 22 21 -6.820 143.810 6.7 1693.4 0 NEW GUINEA, PAPUA NEW GUINEA

2000 7 16 3 20 20.250 122.040 6.8 PHILIPPINE ISLANDS REGION
2000 7 16 3 56 -7.750 150.920 7.3 4440.2 0 NEW BRITAIN REGION, P.N.G.

2000 7 31 22 43 -16.700 174.540 6.2 FIJI ISLANDS REGION
2000 7 31 23 1 -29.280 -176.350 6.2 1681.4 0 KERMADEC ISLANDS REGION

2001 11 13 9 47 22.370 -106.970 6.1 NEAR COAST OF CENTRAL MEXICO
2001 11 13 10 43 53.630 170.550 6.0 7545.2 0 NEAR ISLANDS, ALEUTIAN ISLANDS

2002 1 1 10 39 -55.210 -129.000 6.0 PACIFIC-ANTARCTIC RIDGE
2002 1 1 11 28 6.300 125.650 6.3 11566.8 0 MINDANAO, PHILIPPINE ISLANDS

2002 8 14 13 11 7.830 136.880 6.3 WESTERN CAROLINE ISLANDS
2002 8 14 13 56 14.100 146.200 6.5 1234.3 0 MARIANA ISLANDS

2006 6 27 2 39 52.210 176.180 6.2 RAT ISLANDS, ALEUTIAN ISLANDS
2006 6 27 2 59 -19.860 -178.290 6.2 8041.2 0 FIJI ISLANDS REGION

I don't see anything useful, do you?

Roger