Andesitic in the context of "Miravalles"

In volcanology, a lava dome is a circular, mound-shaped protrusion resulting from the slow extrusion of viscous lava from a volcano. Dome-building eruptions are common, particularly in convergent plate boundary settings. Around 6% of eruptions on Earth form lava domes. The geochemistry of lava domes can vary from basalt (e.g. Semeru, 1946) to rhyolite (e.g. Chaiten, 2010) although the majority are of intermediate composition (such as Santiaguito, dacite-andesite, present day). The characteristic dome shape is attributed to high viscosity that prevents the lava from flowing very far. This high viscosity can be obtained in two ways: by high levels of silica in the magma, or by degassing of fluid magma. Since viscous basaltic and andesitic domes weather fast and easily break apart by further input of fluid lava, most of the preserved domes have high silica content and consist of rhyolite or dacite.

Existence of lava domes has been suggested for some domed structures on the Moon, Venus, and Mars, e.g. the Martian surface in the western part of Arcadia Planitia and within Terra Sirenum.

The Soufrière Hills (/ˈsuːfriɛər/) is an active, complex stratovolcano with many lava domes forming its summit on the Caribbean island of Montserrat, an overseas territory of the United Kingdom. After a long period of dormancy, the Soufrière Hills volcano became active in 1995 and continued to erupt until 2010. Its last eruption was in 2013. Its eruptions have rendered more than half of Montserrat uninhabitable, destroying the capital city, Plymouth, and causing widespread evacuations: about two-thirds of the population have left the island. Chances Peak in the Soufrière Hills was the highest summit on Montserrat until the mid-1990s, but it has since been eclipsed by various rising and falling volcanic domes during the recent volcanic activity.

The volcano is andesitic in nature, and the current pattern of activity includes periods of lava dome growth, punctuated by brief episodes of dome collapse which result in pyroclastic flows, ash venting, and explosive eruption. The volcano is monitored by the Montserrat Volcano Observatory. Volcanic gas emissions from this volcano are measured by a multi-component gas analyzer system, which detects pre-eruptive degassing of rising magmas, improving prediction of volcanic activity.

Mount Batulao is an inactive stratovolcano in the Calabarzon region of the Philippines, located in northwest Batangas province along its border with Cavite. It is a flank dissected andesitic stratovolcano of Taal at the northwestern rim of the Taal Caldera which began to form in the late Pliocene period, about 3.4 million years ago. The mountain is a prominent landmark of jagged peaks, rolling to rugged ridges and deep gorges situated just west of the hill station of Tagaytay at the southwestern end of the Tagaytay Ridge. It is well known for its scenery, as well as its retreat centers and resorts located just 85 kilometres (53 mi) south of Manila.