Fears of another landslide and possible tsunami are mounting for the Anak Krakatoa volcano in the Sunda Strait, Indonesia. Scientists with Indonesia’s Meteorology, Climatology and Geophysics Agency (BMKG) have discovered new cracks that could be an early indication of another landslide. These cracks are deep and wide enough to emit steam and ash. A violent explosion of the Krakatoa volcano triggered a deadly tsunami that struck Indonesia on December 22 that struck Java and Sumatra. A landslide formed by these cracks is estimated to be 67 million cubic meters compared to the estimated 90 million cubic meters from the December 22 event.
The Devil’s Slide Tunnel project is on schedule and on budget according to a news story at ABC7News.com from earlier in June. The video (shown after the break) has a few nice shots showing rock bolting, soil nailing at the portals, and the geologic mapping and laser scanning that happens at the tunnel face.
I also came across a very neat article about how the Ocean Shore Railroad Company was the first to try to cut into the slope along what is now PCH 1 at the Devil’s Slide back in the early 1900s. They were trying to connect the then rural farming community of Half-Moon Bay with San Francisco. The railroad fought the reoccurring landslide and serious rockfalls. Ocean Shore Railroad went bankrupt in 1922 and pulled up its rails, making room for the current highway. (Photo at left from halfmoonbaymemories.com)