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(a)
106
0
110
0
114
0
6
0
Krakatau
Donau
Salak
Tangkuban Prahu
Guntur
Tjerimai
Muriah
Ungaran
Merbabu
Merapi
1000
Dieng
Sundoro
Sumbing
Slamet
Papandajan
Galunggung
Tjikurai
Bromo
Semeru
BALI
Kelud
Batur
Agung
Seraja
1000
10
0
0
1000
Bathymetric Contour(m)
6000
6000
Benioff Zone depth (km)
VOLCANO
Tholeiitic
Calc-alkaline
High-Kcalc-alkaline
High-K alkaline
0
100km
106 E
0
114 E
0
(b)
FLORES SEA
8
0
P. Satonda
Sangea
ng
API
200 km
LOMBOK
Soromundi
Tambora
Rindjani
G.Sangenges
100
9
0
SUMBAWA
Active Volcano
Volcano Inactivated in Quaternary
Creater of Caldera
Benioff Zone Depth Contour
INDIAN OCEAN
100
0
25 50
75 km
116
0
117
0
118
0
119
0
Fig. 4.5 a Regional tectonic setting of Java and Bali. Bathymetry (after Hamilton 1974) and
Benioff zone contours (after Hamilton 1972). Volcanoes are denoted by triangles. b Locality map
showing the islands of Lombok and Sumbawa and five other volcanoes (after Foden and Varne
1980). The Benioff-zone contours (after Hamilton 1974)
The active volcanoes of Bali, Batu Tara and Agung erupted melts of basalt-
andesite-dacite series of rocks. Rindjani volcano in Lambok occurring towards east
also erupted calc-alkalic melts. The active shoshonitic volcanoes of Tambora and
Sangeang Api, located at Sumbawa, erupted however, melts of nepheline-bearing
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