Mahameru, is a famous name from the summit of Mount Semeru, with a height of ± 3676 meters above sea level (masl), placing itself as the highest mountain in Java. Mount Semeru is one of a still active volcano in East Java, located between the Administration and Lumajang Malang Regency with geographical position between 7 ° 51 ‘- 8 ° 11′ south latitude, 112 ° 47 ‘- 113 ° 10′ East Longitude .
The peak of Mount Semeru (Mahameru) can be seen clearly from the city of Malang, and some other places with a perfect cone shape, but on the actual conditions in a broad dome-shaped peak with field heave every ridge. Saloko Jonggring Crater in 1913 and in 1946 broke the edge of the crater caused lava flows south of the region gets Pasirian, Candipura and Lumajang.
Mount Semeru is the youngest of the Mountains Jambangan but has developed into a large strato-volcano separate. Activities that release of volcanic material in the form of ash eruptions, lava blocks of old and young lava bombs, volcanic lava material mixed with rain water or river water, eruption of the cone that causes landslides, growth is slow / gradual than a grain of lava and glowing hot lava a few times.
Geological formation of Mount Semeru volcano is the result of young quarter, with the type of rock consisting of: ash sand / tuff and volcanic intermedian to base with volcanic and physiographic associations regosol andosof gray and gray with ash parent material / sand dab tuff intermedian to base. Geological structure that does not produce rock solid and granulated bond is not strong, easily eroded rainy season.
Type of soil is regosol, is a land with little development segabungan profile with little development of profiles with shallow solum, thin on solid parent material. In general, other high places, areas along the route of travel from the start Ranu Pane (2,200 m above sea level) until the peak Semeru has a relatively cool temperature. The average temperature ranges between 30C-80C at night and early morning, whereas during the day ranged between 00C-120C occasionally occur in some areas hail that occurred during the rainy season changes to dry season and vice versa.
The cold temperatures along the route of travel is not solely caused by the still air but are supported by the wind that blows air into the area became increasingly cold. Based on the topography of the region at the macro level, the wind pattern is erratic in the sense of domination hard to determine wind direction is always changing. Topography that surrounded by high cliffs around 200-500 meters actually possible to resist the flow of wind speed, but because many gap / corridor cliffs, the wind currents are not restrained even rode with a faster speed.
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