Golden Gate Bridge, San Francisco

28 09 2013

Golden Gate Bridge, San Francisco

Snapped this 70’s style postcard shot out the window with an iPhone 4S while my copilot took the reigns of our Cessna 172. Twenty minutes or so earlier, and in homage to Maverick’s surf break, I landed at the WWII Half Moon Bay flight strip on runway 03. The trip from San Carlos to Half Moon Bay airport had been a short jump over the range. The coastal flight north along the quake-shaped landscape is thrilling, only to give way to the iconic bridge. Turned right over the city and eventually back to San Carlos after getting routed around SFO.

Sermeq Avannarleq glacier, Torsukattak ice fjord, western Greenland late May 2013

27 09 2013

Sermeq-Avannarleq glacier, Greenland

A view of the Sermeq Avannarleq glacier in Western Greenland and its ice front, 29th May 2013. Take out the window during a flight from London to San Francisco. I did not know which glacier it was until late September when I found it on Google Earth at 70° 3’3.24″N, 50°19’1.22″W. Click on the photo for a full size view. According to the Byrd Polar Research Center, the Sermeq Avannarleq glacier lost 2 square miles from its ice front in 2007 and again in 2008. Increasingly rapid movement of this and other glaciers in south west Greenland  is likely caused by surface melt waters percolating into the glacier, warming and lubricating the ice. You can find more scientific details in the AGU press release about  Phillips et al., 2013.

Senescence II

9 10 2010

Photographic museum – Stockholm – Fotografiska museet III

27 05 2010
fotografiska museet view window lookout ferry stockholm Skeppsholmen photographic museum photo photography women

Window frame and scene - Fotografiska museet - 23 May 2010 opening weekend

The sun, the clouds, the trees and the windmill II

9 05 2010

sun windmill wind power sunset photograph australia solar

Seismic tremor under Katla

29 04 2010
seismic earthquake Iceland Katla volcano volcanic

The Earth shook directly under Mount Katla in Iceland when a small earthquake (magnitude 1.5) was detected at about 6 km depth on Wed 28th April 2010. Is the giant awakening? UPDATE: Another earthquake occurred under Katla. The original 28th April 2010 earthquake is now being reported as two simultaneous earthquakes, one at 7.1 km (magnitude Ml=1.0) and another at 0.5 km depth (Ml=1.5). Heidi Soosalu writing on Katla seismicity (Journal of Volcanology and Geothermal Research, vol 153 177-186, 2006) states that Katla has seasonal earthquake activity. These tremors usually occur later in the year probably because of changes in glacial melting and groundwater pressure in the roof of the caldera. Seismic shocks shake two distinct areas of Katla, the Goðabunga rise on the west side, and the caldera area in the center of Katla. The latest two earthquakes are associated with the rim of the caldera. A third earthquake occurred today on the southern slopes of Katla (magnitude 1.7 at about 7km depth). Since 2002, seismic activity has been fairly continuous over and above the seasonal effect, particularly on the Goðabunga rise during 2001-2004. However a seasonal effect is still evident - earthquakes are less frequent in winter. The increased seismic activity since 2001-2002 is attributed to acceleration of a rising dome of highly silicic, viscous magma 1.5km down stressing and deforming the roof above it. Inflation of the volcano and increased geothermal activity have accompanied the increased seismicity since 1999. Because of the rising dome under Goðabunga rise, several eruption scenarios are worth considering besides the more "traditional" basaltic eruption from the caldera. These include a more silicic style event, a type that has not occurred in Katla for more than 1700 years, and could be extremely violent. Seismicity preceding silicic eruptions have been noted by Soosalu et al 2006 at Unzen in Japan and in the Soufrière Hills of Montserrat in the context of a silicic Katla eruption. The good news so far is that the current seismicity cannot be easily attributed to anything but ongoing activity started in 1999. Signs of an imminent eruption will include further increases in hydrothermal activity and ground uplift - neither of which have been reported as anomalous so far. The not so good news is that post-1999 earthquakes shout loudly at us to not ignore the slumbering beast, and accept the possibility that an explosive eruption from the Goðabunga rise on the west side of Katla could be more than a little bit bigger than the current Eyjafjallajökull eruption! Image © Robert Corkery 2010.

Icelandic horse and Eyjafjallajökull volcano

20 04 2010

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