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Major magnitude 7.0 earthquake - 63 km southeast of Ilagan, Province of Isabela, Cagayan Valley, Philippines, on Friday, March 18, 1977 at 21:43 GMT

Major magnitude 7.0 earthquake - 63 km southeast of Ilagan, Province of Isabela, Cagayan Valley, Philippines, on Friday, March 18, 1977 at 21:43 GMT

Major magnitude 7.0 earthquake at 37 km depth

1 Jan 00:00 UTC: First to report: USGS after 30 seconds.
Date & time: Mar 18, 1977 21:43:52 UTC
Magnitude: 7
Depth: 37.0 km
Epicenter latitude / longitude: 16.773°N / 122.327°E (Province of Isabela, Cagayan Valley, Philippines)
Antipode: 16.773°S / 57.673°W
Nearest volcano: Ambalatungan (144 km / 89 mi)
Nearby towns and cities:
41 km (25 mi) SE of San Mariano (pop: 12,400) --> See nearby quakes!
63 km (39 mi) SE of Ilagan (pop: 72,400) --> See nearby quakes!
67 km (42 mi) E of Alicia (Isabela) (pop: 24,700) --> See nearby quakes!
80 km (50 mi) E of San Mateo (Isabela) (pop: 16,200) --> See nearby quakes!
83 km (52 mi) E of Santiago (pop: 108,400) --> See nearby quakes!
84 km (52 mi) E of Ramon (pop: 36,300) --> See nearby quakes!
94 km (58 mi) SE of Cabagan (Isabela) (pop: 25,300) --> See nearby quakes!
114 km (71 mi) SE of Tuguegarao City (pop: 115,100) --> See nearby quakes!
260 km (161 mi) NE of Angeles City (Central Luzon) (pop: 299,400) --> See nearby quakes!
281 km (175 mi) NNE of Manila (National Capital Region) (pop: 1,600,000) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 2 x 1015 joules (554 gigawatt hours, equivalent to 4.8 x 105 tons of TNT or 29.8 atomic bombs!) | about seismic energy
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Data for the same earthquake reported by different agencies

Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
Mag.DepthLocationSource
7.037 kmLuzon, PhilippinesUSGS
Note: for quakes of 2012 and earlier, our database often contains only records from USGS.

User reports for this quake

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
There are no user reports for this quake.
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Aftershocks

[More info]

Recorded aftershocks, latest first (63 quakes)

Date and timeMag
Depth
LocationDetails
Oct 12, 1978 02:18
44 years ago
4.6

54 km
70 km SE of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
Oct 6, 1978 16:08
44 years ago
5.1

16 km
Province of Aurora, Central Luzon, 59 km E of Santiago, PhilippinesMore
Apr 19, 1978 19:37
44 years ago
4.9

38 km
27 km S of Estagno Island, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 21, 1978 13:42
44 years ago
5.3

43 km
27 km S of Estagno Island, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 18, 1978 04:44
44 years ago
4.9

87 km
92 km E of Cabanatuan City, Province of Nueva Ecija, Central Luzon, PhilippinesMore
Mar 16, 1978 22:49
44 years ago
4.9

46 km
27 km NE of Estagno Island, Province of Isabela, Cagayan Valley, PhilippinesMore
Feb 13, 1978 22:22
44 years ago
4.5

66 km
58 km E of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
Oct 30, 1977 20:52
45 years ago
5.1

58 km
141 km NE of Polillo Island, Quezon, Calabarzon, PhilippinesMore
Oct 9, 1977 15:24
45 years ago
4.5

58 km
62 km SE of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
Aug 18, 1977 17:46
45 years ago
5.0

33 km
31 km E of Estagno Island, Province of Isabela, Cagayan Valley, PhilippinesMore
Aug 2, 1977 02:10
45 years ago
5.1

33 km
118 km E of Tuguegarao City, Cagayan, PhilippinesMore
Jul 27, 1977 17:25
45 years ago
5.4

41 km
34 km S of Estagno Island, Province of Isabela, Cagayan Valley, PhilippinesMore
Jul 25, 1977 19:31
45 years ago
4.8

33 km
268 km NE of Manila, Capital District, National Capital Region, PhilippinesMore
Jul 22, 1977 21:37
45 years ago
4.7

50 km
33 km E of Estagno Island, Province of Isabela, Cagayan Valley, PhilippinesMore
Jul 22, 1977 05:13
45 years ago
5.1

46 km
Estagno Island, 69 km SE of Tuguegarao City, Cagayan, PhilippinesMore
Jul 22, 1977 00:45
45 years ago
4.8

85 km
64 km E of Santiago, Province of Isabela, Cagayan Valley, PhilippinesMore
Jul 21, 1977 22:08
45 years ago
4.5

33 km
70 km E of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
Jul 21, 1977 18:55
45 years ago
5.1

46 km
Estagno Island, 88 km SE of Tuguegarao City, Cagayan, PhilippinesMore
Jul 21, 1977 15:23
45 years ago
4.7

33 km
87 km E of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
Jul 21, 1977 13:45
45 years ago
6.9

33 km
58 km SE of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
Jul 10, 1977 01:47
45 years ago
4.6

33 km
93 km SE of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
May 24, 1977 05:20
45 years ago
4.9

33 km
70 km SE of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
May 18, 1977 03:53
45 years ago
4.9

33 km
73 km SE of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
May 12, 1977 14:00
45 years ago
5.0

16 km
Luzon, Central Luzon, 75 km SE of Baguio City, PhilippinesMore
Apr 29, 1977 13:01
45 years ago
4.4

70 km
82 km SE of Santiago, Province of Isabela, Cagayan Valley, PhilippinesMore
Apr 20, 1977 15:21
45 years ago
5.4

33 km
7.7 km NW of Tuguegarao City, Cagayan, PhilippinesMore
Apr 19, 1977 05:09
45 years ago
4.7

43 km
92 km N of Jose Panganiban, Province of Camarines Norte, Bicol, PhilippinesMore
Apr 9, 1977 14:10
45 years ago
4.5

68 km
68 km SE of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 31, 1977 15:34
45 years ago
4.8

60 km
96 km E of Santiago, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 28, 1977 00:52
45 years ago
4.5

40 km
67 km E of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 26, 1977 00:09
45 years ago
4.6

33 km
Estagno Island, 83 km SE of Tuguegarao City, Cagayan, PhilippinesMore
Mar 24, 1977 19:33
45 years ago
5.1

33 km
85 km SE of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 23, 1977 23:16
45 years ago
4.8

78 km
85 km SE of Santiago, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 22, 1977 06:57
45 years ago
4.6

70 km
79 km SE of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 21, 1977 08:41
45 years ago
4.9

53 km
94 km SE of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 21, 1977 08:05
45 years ago
4.5

38 km
89 km SE of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 21, 1977 06:28
45 years ago
4.6

33 km
70 km SE of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 20, 1977 14:15
45 years ago
4.8

33 km
97 km SE of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 20, 1977 11:01
45 years ago
5.0

27 km
115 km E of Santiago, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 20, 1977 10:39
45 years ago
4.8

33 km
84 km SE of Santiago, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 20, 1977 07:45
45 years ago
3.8

33 km
62 km SE of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 19, 1977 19:35
45 years ago
5.8

39 km
62 km SE of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 19, 1977 14:30
45 years ago
5.2

33 km
32 km S of Estagno Island, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 19, 1977 13:27
45 years ago
4.7

53 km
79 km SE of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 19, 1977 13:00
45 years ago
5.5

33 km
75 km SE of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 19, 1977 12:56
45 years ago
5.3

33 km
82 km SE of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 19, 1977 12:17
45 years ago
5.4

33 km
94 km E of Santiago, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 19, 1977 11:54
45 years ago
5.0

33 km
61 km SE of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 19, 1977 08:22
45 years ago
4.9

45 km
76 km SE of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 19, 1977 07:22
45 years ago
5.2

33 km
94 km SE of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 19, 1977 06:05
45 years ago
5.1

33 km
86 km SE of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 19, 1977 05:06
45 years ago
4.6

33 km
95 km SE of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 19, 1977 03:46
45 years ago
5.0

33 km
151 km SE of Tuguegarao City, Cagayan, PhilippinesMore
Mar 19, 1977 03:02
45 years ago
5.1

34 km
26 km SE of Estagno Island, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 19, 1977 01:53
45 years ago
5.3

49 km
24 km S of Estagno Island, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 19, 1977 01:29
45 years ago
5.0

33 km
98 km E of Santiago, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 19, 1977 01:23
45 years ago
4.9

72 km
88 km E of Santiago, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 19, 1977 01:04
45 years ago
4.9

47 km
96 km E of Santiago, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 19, 1977 00:51
45 years ago
5.1

58 km
Province of Isabela, 97 km SE of Tuguegarao City, Cagayan, PhilippinesMore
Mar 19, 1977 00:41
45 years ago
5.2

33 km
70 km SE of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 18, 1977 23:57
45 years ago
5.3

33 km
80 km SE of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 18, 1977 22:38
45 years ago
5.0

33 km
71 km E of Ilagan, Province of Isabela, Cagayan Valley, PhilippinesMore
Mar 18, 1977 22:34
45 years ago
5.2

33 km
66 km E of Santiago, Province of Isabela, Cagayan Valley, PhilippinesMore
Show all

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