Arjuno-Welirang is a stratovolcano

Stratovolcano

A stratovolcano, also known as a composite volcano, is a tall, conical volcano built up by many layers of hardened lava, tephra, pumice, and volcanic ash. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile and periodic, explosive eruptions...

 in the province of East Java

East Java

East Java is a province of Indonesia. It is located on the eastern part of the island of Java and includes neighboring Madura and islands to its east and to its north East Java is a province of Indonesia. It is located on the eastern part of the island of Java and includes neighboring Madura and...

 on Java

Java

Java is an island of Indonesia. With a population of 135 million , it is the world's most populous island, and one of the most densely populated regions in the world. It is home to 60% of Indonesia's population. The Indonesian capital city, Jakarta, is in west Java...

, Indonesia

Indonesia

Indonesia , officially the Republic of Indonesia , is a country in Southeast Asia and Oceania. Indonesia is an archipelago comprising approximately 13,000 islands. It has 33 provinces with over 238 million people, and is the world's fourth most populous country. Indonesia is a republic, with an...

. It is a twin volcano, with the 'twins' being Arjuno and Welirang. There is at least one other stratovolcano in the area, and there are around 10 pyroclastic cones

Volcanic cone

Volcanic cones are among the simplest volcanic formations. They are built by ejecta from a volcanic vent, piling up around the vent in the shape of a cone with a central crater. Volcanic cones are of different types, depending upon the nature and size of the fragments ejected during the eruption...

 nearby. They are located in a 6 km line between Arjuno and Welirang. The Arjuno-Welirang volcanic complex itself lies in the older two volcanoes, Mount Ringgit to the east and Mount Linting to the south. The summit lacks vegetation. Fumarolic

Fumarole

A fumarole is an opening in a planet's crust, often in the neighborhood of volcanoes, which emits steam and gases such as carbon dioxide, sulfur dioxide, hydrochloric acid, and hydrogen sulfide. The steam is created when superheated water turns to steam as its pressure drops when it emerges from...

 areas with sulfur

Sulfur

Sulfur or sulphur is the chemical element with atomic number 16. In the periodic table it is represented by the symbol S. It is an abundant, multivalent non-metal. Under normal conditions, sulfur atoms form cyclic octatomic molecules with chemical formula S8. Elemental sulfur is a bright yellow...

 deposits are found in several locations on Welirang.

The name Arjuno is Javanese

Javanese language

Javanese language is the language of the Javanese people from the central and eastern parts of the island of Java, in Indonesia. In addition, there are also some pockets of Javanese speakers in the northern coast of western Java...

 rendition of Arjuna

Arjuna

Arjuna in Indian mythology is the greatest warrior on earth and is one of the Pandavas, the heroes of the Hindu epic Mahābhārata. Arjuna, whose name means 'bright', 'shining', 'white' or 'silver' Arjuna (Devanagari: अर्जुन, Thai: อรชุน, Orachun, Tamil: Arjunan, Indonesian and Javanese: Harjuna,...

, a hero in Mahabharata

Mahabharata

The Mahabharata is one of the two major Sanskrit epics of ancient India and Nepal, the other being the Ramayana. The epic is part of itihasa....

 epic, while Welirang is Javanese word for sulfur.

An 1950 eruption had a VEI

Volcanic Explosivity Index

The Volcanic Explosivity Index was devised by Chris Newhall of the U.S. Geological Survey and Stephen Self at the University of Hawaii in 1982 to provide a relative measure of the explosiveness of volcanic eruptions....

=2. There was an explosive eruption

Explosive eruption

An explosive eruption is a volcanic term to describe a violent, explosive type of eruption. Mount St. Helens in 1980 was an example. Such an eruption is driven by gas accumulating under great pressure. Driven by hot rising magma, it interacts with ground water until the pressure increases to the...

. Another eruption occurred 2 years later. This eruption had a VEI=0.

A 300 hectares at slope of Mount Arjuno near the road of Surabaya

Surabaya

Surabaya is Indonesia's second-largest city with a population of over 2.7 million , and the capital of the province of East Java...

-Malang

Malang

Malang is the second largest city in East Java province, Indonesia. It has an ancient history dating back to the Mataram Kingdom. The city population at the 2010 Census was 819,708. During the period of Dutch colonization, it was a popular destination for European residents. The city is famous for...

 is used by Taman Safari

Taman Safari

Taman Safari Indonesia or simply Taman Safari are safari parks in Bogor at West Java, in Mount Arjuno at East Java, and in Marina Beach in Bali. Part of the same organization, they are known as Taman Safari I, II and III. The most popular is Taman Safari I.-Taman Safari I:Taman Safari is located...

II.