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Geoscience Letters

Official Journal of the Asia Oceania Geosciences Society (AOGS)

Fig. 5 | Geoscience Letters

Fig. 5

From: Discovery of a conical feature in Halmahera waters, Indonesia: traces of a late-stage hydrothermal activity

Fig. 5

Subsurface structure based on 2.5-D magnetic forward modelling. Stars: observed magnetic anomaly. Solid line: modelled magnetic anomaly. Profile bearing: 127°. Inclination: − 13.91°. Declination: 0.33°. The root mean square errors (RMSE) of each model are displayed. a A volcanic body (S = 0.0055 cgs) was introduced into the model, with a highly altered volcanic crust (S = 0.0005 cgs) below and sedimentary cover with no magnetisation on both sides (NW and SE). b An intrusive body (S = 0.0025 cgs) was introduced into the model (a) to represent the possible presence of altered/serpentinised materials. The volcanic body was set at 0.006 cgs. c A volcanic body with remanent magnetisation of 2° inclination (VBR2) was introduced to model a more typical field direction in the present magnetic epoch in the equator. d Two VBR2 bodies underlie a volcanic body of 0.003 cgs susceptibility, which dominates the surface of the feature. The bigger underlying volcanic body has 1.35 times the magnetic intensity of the other magnetised bodies

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