Oberaargletscher 2017

Oberaargletscher as seen from the hydropower dam. The area of study is highlighted (2016 photo).

Boulder OA1 seen from the N on July 2nd, July 18th, August 5th and August 16th, 2017. It was encountered first forming a glacier table, then it fell off towards the E, a small crevasse opened under the boulder, then a new ice pedestal began to form. Total lateral displacement was only 1.5 metres towards the east (relative to the ice; photos Lea Schwendener).

Boulder OA2 seen from the SW on July 2nd, July 18th, August 5th and August 16th, 2017. In total this boulder moved 4.8 metres towards the southeast (relative to the ice), leaving behind a particularly well developed ice tail (photos Lea Schwendener).

Boulder OA3 seen from the E on July 2nd, before and after falling off the ice pedestal, on July 18th, August 5th and August 16th, 2017, after sliding off again. In total this boulder moved 2.8 metres towards the southeast (relative to the ice; photos Lea Schwendener).

Glacier table encountered just before the capping boulder fell off (without being touched). This boulder was used in the study as boulder OA3. The brown boulder on the left is OA4. South is on the right; Oberaarsee, dammed for hydropower generation, is in the background (photos Lea Schwendener).

Panoramic view of boulder OA2 on July 17th, 2017 from the southwest. Note the long and prominent ice tail the boulder left behind on the left (photo Lea Schwendener).

Lea Schwendener is standing on the ice tail while taking a photo of a typical tabular boulder on October 18th, 2016. The boulder is tilted towards the SE. Dammed Oberaarsee is in the background, the view is towards ENE (photo Jürg Alean).

Well developed glacier table with the boulder close to falling off on July 2nd, 2017; it is located near the medial moraine, visible on the right. The view is towards NW, the boulder will fall towards the SE (photo Lea Schwendener).

Glacier table with its capping boulder precariously leaning towards the SE on October 16th, 2016; view towards NW. A tail extends towards the right (photo Jürg Alean).

Extremely asymmetrical glacier table within the medial moraine on July 2nd, 2017. The view is towards NW (photo Lea Schwendener).

Large tabular boulder beginning to crate a massive glacier table; cf. next picture (photo Michael Zemp, Sept. 19th, 2020).

The same glacier table only 15 days later; cf. previous picture (photo Michael Zemp, Sept. 4th. 2020).

Just a nice glacier table - view downglacier, south is to the right (photo Jürg Alean).