The mountain, as well as its surrounding land-forms, is geographically close to the volcanic caldera at the center of Faial.

The eruptive igneous rocks produced by this caldera forms the base of Tambroso, as well as many other peaks on Faial Island.

[1] The whole series of peaks has a maximum elevation at Cabeço Gordo, which is 1,043 metres (3,422 ft) above sea level.

[2] The lower portion of this volcanic complex's formation began in the middle Pleistocene's Chibanian age, while upper portion consists mainly of pyroclastic flows and other deposits that date from the late Pleistocene up to the year 1958, which marked the most recent eruption on Faial Island.

[2] The area around the base of Tambroso may also be affected by uplift and other types crustal movement along an east-west trending fault which is situation to the south of the mountain.