A Natural Resource Management Guide for the County of Morris A ...

An Historical Perspective Of Earthquakes With Epicenters In Or Near Morris County
ID DATE LOCATION INTENSITY ID DATE LOCATION INTENSITY
1 11/24/1783 Near Petersburg IV 12 12/26/1977 Schooley's Mt. 1.7 Felt
1 11/29/1783 Near Petersburg VI 13 02/15/1978 Boonton 1.6
1 11/30/1783 Near Petersburg IV 14 05/18/1978 Milton 1.5 Felt
1 11/30/1783 Near Petersburg VI 15 06/12/1978 Woodstock no data
1 11/30/1783 Near Petersburg IV 15 06/15/1978 Woodstock no data
2 08/10/1880 Near Morristown III 14 06/30/1978 Milton IV
2 09/01/1880 Near Morristown III 14 06/30/1978 Milton III
3 03/23/1957 Schooley's Mt. VI 16 01/30/1979 Harding V
4 08/14/1969 Lake Hopatcong 1.0 17 02/01/1979 Chester 1.9
4 09/14/1969 Lake Hopatcong 1.0 18 02/01/1979 Chester III 1.9
4 10/06/1969 Lake Hopatcong IV 1.3 19 02/01/1979 Mendham Twp. 1.8
4 10/10/1969 Lake Hopatcong 1.0 17 02/01/1979 Chester 1.5
4 11/03/1969 Lake Hopatcong 1.0 20 02/02/1979 Mendham Twp. III
5 01/17/1976 Riverdale 1.8 21 02/23/1979 Washington no data
6 03/11/1976 Riverdale V 2.8 22 02/23/1979 Chester IV
7 03/11/1976 Near Boonton VI 23 02/23/1979 Washington 1.8
8 03/12/1976 Riverdale 2.2 Felt 24 03/09/1979 Harding V 3.1
9 10/27/1976 Denville Foreshock 1.0 4 03/22/1979 Lake Hopatcong no data
9 10/27/1976 Denville 1.0 25 03/19/1981 Boonton 2.0
9 10/28/1976 Denville Aftershock 1.0 26 06/01/1983 Dover 1.5
3 12/05/1976 Schooley's Mt. III 27 06/03/1984 Kinnelon 1.3
10 12/05/1976 Schooley's Mt. 1.8 Felt 28 06/06/1984 Near Morristown 1.7
10 12/06/1976 Schooley's Mt. 1.7 Felt 29 08/01/1984 Mt. Olive 1.7
11 01/06/1977 Near Green Pd. no data 30 10/25/1984 Near Mt. Olive 2.0
12 12/04/1977 Schooley's Mt. 1.8 Felt 31 12/02/1984 Byram, Sussex Co. 1.5
12 12/04/1977 Schooley's Mt. 2.1 Felt 31 12/13/1984 Byram, Sussex Co. 1.7
12 12/06/1977 Schooley's Mt. 1.6 Felt 29 12/15/1984 Byram, Sussex Co. 1.8
12 12/07/1977 Schooley's Mt. 2.3 Felt 31 12/17/1984 Byram, Sussex Co. 1.6
12 12/23/1977 Schooley's Mt. 1.4 Felt 30 02/08/1986 Flanders 1.7
12 12/24/1977 Schooley's Mt. 1.6 Felt 32 06/29/1986 Kinnelon 1.5
12 12/25/1977 Schooley's Mt. 1.5 Felt 33 04/24/1987 S. of Mohawk Lake, Sussex Co. 1.9
INTENSITY* EQUIV.MAGNITUDE** EFFECTS
I 1.9 Usually imperceptible to people
II 2.5 Felt indoors by few; some gentle swaying of suspended objects and liquids
III 3.1 Felt indoors by several; sensation of passing light truck traffic
IV 3.7 Felt indoors by many; causes creaks, rattle, and swinging of hanging objects
V 4.3 Felt indoors by most; buildings tremble; swinging or moving most objects
VI 4.9 Felt indoors by all; cracking and falling of plaster; falling of small-sized objects
*modified Mercalli intensity-The Mercalli scale ranks earthquakes from I through XII, although in this table only I through VI are shown because
the most intense earthquake in Morris County ranked VI.
**Although earthquakes of the same maximum intensity do not always have the same magnitudes. 4
Most earthquake activity in the county has been related to movement along the Ramapo and Green Pond Faults, as well as the Long Valley Fault
centered in Hunterdon County.
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Geologic History of Morris County