Pdf the toba caldera complexity

Resurgent tobafield, chronologic, and model constraints. Erupting at least 2800 km3 of magma in a single event. Pdf distribution of magma beneath the toba caldera. The toba catastrophe theory holds that this event caused a global volcanic winter of six to ten years and possibly a 1,000yearlong cooling episode. Stratigraphy of the toba tuffs and the evolution of the toba caldera. We therefore use toba as a casestudy to assess the utility of quartz as a tracer of preeruptive magmatic processes, especially since toba eruptive rocks are particularly quartz rich 23,24. Its rich history of research for over a century has yielded important information on the physical volcanology of silicic calderas and supereruptions, geochemical evolution of silicic magma bodies, and geophysical imaging of active subvolcanic systems. Volcanic supereruptions eject thousands of times the volume of the largest documented eruptions over human history. Distribution of magma beneath the toba caldera complex. A large magmatic sill complex beneath the toba caldera science. Abstract the toba caldera in indonesia is one of the most remarkable volcanic features formed during quaternary geologic time. Distribution of magma beneath the toba caldera complex, north sumatra, indonesia, constrained by threedimensional p wave velocities, seismicity, and gravity data may 2001 geochemistry geophysics. Magma reservoir dynamics at toba caldera, indonesia. P and s velocity structure beneath the toba caldera complex northern sumatra from local earthquake tomography 5 10 15 20 25 ivan koulakov 1, 2, tedi yudistira 3, birgerg.

Distribution of magma beneath the toba caldera complex, north sumatra, indonesia, constrained by threedimensional p wave velocities, seismicity, and gravity. Available online xxx abstract the toba caldera in indonesia is one of the most remarkable volcanic. A large magmatic sill complex beneath the toba caldera. Four separate eruptions have occurred from vents within the present collapse structure, which formed from eruption of the 2800 km3 youngest toba tuff ytt at 74 ka. The toba caldera is the site of the largest pleistocene eruption at 74,000 years ago, yet the magmatic plumbing system remains poorly understood. Stratigraphy of the toba tuffs and the evolution of the.

P, s velocity and vpvs ratio beneath the toba caldera. Carbon14 dating, lake sediments, toba caldera, resurgence, numerical modeling, magmatic. Luehr2 and wandono 4 1institute of petroleum geology and geophysics, sb ras, prospekt akademika koptuga, 3, novosibirsk, 630090, russia. It is one of the earths largest known explosive eruptions. The youngest toba eruption was a supervolcanic eruption that occurred around 75,000 years ago at the site of presentday lake toba in sumatra, indonesia. P and s velocity structure beneath the toba caldera. Several supervolcanoes capable of this type of unimaginable devastation dot the surface of earth today.

The toba caldera, north sumatra, is thought to originate from subduction of the investigator ridge transform fault sited on the indoaustralian plate beneath the sunda trench, leading to. The steepwalled caldera contains lake toba, the largest volcanic lake on the planet. Inversions reveal the presence of p velocities up to 37% below normal that likely map the distribution of magma. Department of geology and geography, eastern illinois university. Eruption of the three older toba tuffs alternated from calderas situated in northern and southern. We used ambientnoise seismic tomography below the toba caldera in northern sumatra to observe the anisotropy that we interpret as the. Chesner department of geologygeography, eastern illinois university, charleston, il 61920, united states article info article history. Ten samples from the toba caldera complex were collected from four different groups eight samples from three distinct lava domeflow. Luehr 2, and wandono 4 1 institute of petroleum geology and geophysics, sb ras, prospekt akademika koptuga, 3, novosibirsk, 630090, russia email. Pdf distribution of magma beneath the toba caldera complex. To fully resolve the complexity of the toba crystal record, however, isotopic heterogeneities need to be resolved in more detail. Available online xxx abstract the toba caldera in indonesia is one of the most remarkable volcanic features formed during quaternary geologic time. Distribution of magma beneath the toba caldera complex, north. The toba caldera in indonesia is one of the most remarkable volcanic features formed during quaternary geologic time.