Terremoto moderado mag. 5.1 - Philippines Sea, 63 km N of Gura Tabailenge Island, North Maluku, Indonesia, Wednesday, 29 Jul. 1987

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Fecha & hora: 29 Jul 1987 21:15:00 UTC
Magnitud: 5.1
Profundidad: 213.1 km
Epicentro latitud / longitud: 2.945°N / 128.612°E (Philippines Sea, Indonesia)
Volcán mas cercano: Tarakan (151 km / 94 mi)
Nearby towns and cities:
151 km al NNE de Tobelo (Kabupaten Halmahera Utara) (pop: 10,000) --> ¡Vea sismos cercanos!
272 km al NNE de Sofifi (Kota Tidore Kepulauan) (pop: 36,200) --> ¡Vea sismos cercanos!
276 km al NNE de Ternate (pop: 101,700) --> ¡Vea sismos cercanos!
415 km al ENE de Bitung (pop: 137,400) --> ¡Vea sismos cercanos!
449 km al ENE de Manado (pop: 451,900) --> ¡Vea sismos cercanos!
450 km al ENE de Tondano (Kabupaten Minahasa) (pop: 33,300) --> ¡Vea sismos cercanos!
460 km al ENE de Tomohon (pop: 27,600) --> ¡Vea sismos cercanos!
517 km al NO de Sorong (pop: 125,500) --> ¡Vea sismos cercanos!
519 km al SSE de Mati (Filipinas) (pop: 105,900) --> ¡Vea sismos cercanos!
519 km al SE de General Santos City (Filipinas) (pop: 679,600) --> ¡Vea sismos cercanos!
Fuente primaria de datos: USGS (United States Geological Survey)
Energía liberada estimada: 2.8 x 10¹² joules (783 megawatt hours, equivalent to 674 tons of TNT) More info

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Based on its magnitude, the fault that was active during the quake ruptured along a surface of approx. 13 km² (=5 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 6 km (4 mi).
Aftershocks typically occur during the days and weeks following the quake at or near the same fault, at distances of up to approx. two times the length of the rupture zone.
The often broadly linear arrangement of aftershock epicenters encompasses the rupture zone of the main shock (check on the map below to verify).

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