Another fun weekend for me analyzing zircon on the SHRIMP-RG at Stanford University! I really know how to live it up during the summer.
Some news bits:
The 2009 dome at Redoubt in Alaska steaming on July 2, 2009. Image taken by Cyrus Read, courtesy of USGS/AVO
- In another sign that Redoubt's 2009 eruption might be at an end, AVO has ceased 24 hour staffing of their operations center. They still warn that Redoubt might still have more activity up its sleeve, but as of now, things are pretty quite. The latest update on Redoubt reports that the new dome continues to steam away and seismicity still remains very slightly above background levels. The volcano currently sits at Yellow / Advisory status.
- PHIVOLCS officials have raised the alert status at Mayon to Level 2 (this link has video of the steaming volcano), which indicates "moderate unrest". Low-frequency earthquakes have increased, suggesting the movement of magma in the edifice, the glow at the summit has increased and the 1 cm / 0.5 inches of inflation of the edifice has been sustained. Now, exactly what on the edifice has inflated is unclear - mostly like it can be seen on the sides of the volcano where they measure the slope of the volcano. In any case, all of these signs would definitely point towards an increased chance of eruption. No new evacuation orders have been issued, but PHIVOLCS recommended that the six kilometer / 3.7 miles Permanent Danger Zone and 7 kilometer / 4.4 mile Extended Danger Zone be called "off limits."
That's funny - I've seen bits and pieces of SHRIMP in various workshops but I've never seen an assembled machine (although I know of 2 in proximity). So what's the big deal with SHRIMP; I haven't met anyone who could tell me. :}
I'm not a scientist, but I got curious about the Shrimp RG. Here is what I found at http://shrimprg.stanford.edu/page2frame.html
âThe SHRIMP RG has capabilities that are common to most ion microprobes, that is the direct sampling of a target through sputtering a small volume of material. The special feature of the SHRIMP RG is the capability of extremely high mass resolution which allows the exclusion of more isobaric interferences. Trace element analysis is being carried out at high mass resolution rather than using the energy filtering technique. We are currently working on the development of a set of standards of geologically useful materials.
SHRIMPs are well known for U-Pb geochronology, and we have developed highly successful protocols for zircon analysis. In addition, the high abundance sensitivity of the SHRIMP RG has allowed us to identify the isobaric interference under Pb-204 in monazite as doubly charged ThNdO2.â
Also, the machine costs about $1,700 dollars a day for âexternal usersâ.
Hope that answers the question - Erik's time is at a premium!
Thought this report might interest some here:
"Like a giant fist punching through the earth, a 1,000-foot long section of the beach below Bluff Point rose up 20 feet from the tidelands sometime last Friday or late Thursday, pushing boulders up from the ocean bottom, cracking sandstone slabs and toppling rocks upside down."
btw there are some good photos of the latest activity at Anak Krakatau at