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| Titel |
Morphology and Relative Age Modeling of Explosive craters in the Tatun
Volcano Group, Taiwan |
| VerfasserIn |
Chen-Kan Liao, Sheng-Rong Song |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250141035
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| Publikation (Nr.) |
 EGU/EGU2017-4499.pdf |
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| Zusammenfassung |
| The Tatun Volcano Group (TVG) is located in the north of Taipei city for only 15 km away,
and has been argued whether it is active or not for a long time. The Chihsingshan volcano is
covered by many gas fumaroles and hot springs and is viewed as a relatively younger volcano
of the TVG. Furthermore, using high-resolution digital elevation model (DEM) can easily
identify two apparent fault zones (or rifting valleys) with many craters, which pass through
the eastern and the western edifice of Chihsingshan volcano, respectively. Shapes of
those craters are nearly circular or elliptic, probably stand for the young eruptive
events.
This study utilizes 1 m x 1 m LiDAR (Light Detection And Ranging) DEM to
investigate the small craters along the fault zones. The boundaries encompassing the
crater were depicted by their steep slope, especially the intact ones. Eight and six
craters have been determined from western and eastern side, and two and three of
them are more intact, respectively. Numerous fractures exist in the linear extent are
similar to the fault zones, but the morphology was destroyed by the downstream river
system. The results of fractal dimensions analysis, a statistic method that tells the
broken level of the shapes, may correlate with the age of those craters. Previous
studies have proven this modeling method can fit the lava flow sequences of the
TVG. Hence we try to find a suitable age modeling for the explosive craters in
the same way, and then we can compare different ones for relative age and focus
on the youngest one. In addition, field sampling at the craters such as Duck Pond
and Dream Lake may be ideal archives of volcanic deposits from young volcanic
events. With the combinations of LiDAR-DEM, fractal dimensions analysis and
field sampling results, we could figure out the formation sequence of the craters. |
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