Previous Toba Lake in North Sumatra, Indonesia
Toba Lake is a volcanic lake in North Sumatra Province, Indonesia. It is the biggest lake in Indonesia and South East Asia. The lake's water isolated by Toba Caldera that keep the water inside the caldera. An outlet stream of Toba Lake water is by Porsea in Toba Samosir Regency. The stream flow the Toba Lake water trough Asahan River to East Coast of North Sumatra in Asahan Regency. Some pictures captured from Google Earth show the measurement of Toba Lake area using Google Earth measurement tools. Some facts measured using Google Earth about Toba Lake area.
Toba Lake water surface is about 900 meter above sea level. It is estimated that the current Toba Lake created by Toba Super Volcano eruption. Toba Super Volcano has erupted several times in past, the last eruption estimated about 74.000 years ago. The eruption created a huge caldera around the Toba Super Volcano. Water from hills around, entered the caldera and gradually rising to the current Toba Lake water level.
The geological process in the Toba caldera is still progressing. The magma beneath the caldera estimated pushed the earth mantle and created Samosir Island. Some hot springs around Toba caldera predicted as the result of the geological progress beneath the Toba Caldera. The hot springs help to deliver the magma tension to the earth surface. The hot springs locations in Samosir Regency are in Simbolon area and Pucuk Buhit area, Sipoholon in North Tapanuli Regency and Lau Sidebuk-debuk in Karo Regency.
Using Google Earth measuring tools, some parameters in Toba Lake is measured. The tools are a ruler tool to calculate the distance of two or more points and a polygon tool to calculate the area in the polygon. Some features that measured using Google Earth are....
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