Measure and trace out a square (preferably at least 12 x 12 in.) on the deposit with the edge of a knife or tool.Machinery, etc.) away from trees or other obstructions. fairly flat roofs, steps not covered by an overhang, docks, Select an area in an open space where ash has directly fallen onto a hard, flat, smooth surface (e.g.If ash falls unexpectedly at your location when there's no snow and before you can get a suitable container placed: If ash fall is unexpected - no snow, no container, Please send them to us with your ash sample. If you have a camera, we would appreciate photos of the ash sampling location.

Reseal and double bag the sample and return to AVO at the Leave the bag open toĪllow the sample to dry a bit for a day or so (doesn't need to be totally dry, just dry enough to ship). This may take a couple of tries, letting the ash resettle each time. Out and then pour off as much water as you can without losing any ash. Placing the bag in a pot will keep it from tipping over as the snow melts. Bring the bag(s) into a warm place so that the snow will melt.Try to measure the thickness to the nearest 1/16th of an inch or to the nearest half millimeter. Place the ash and snow from the square into a plastic zip loc bag.

Carefully remove the ash within the square and some of the underlying snow as shown in figure 1.

Long as the number is unique (no two are the same). We typically use the year, personal initials, and a number (06KW-1) but you can label however you like as

Label your sample bag with a unique sample number.

Measure and trace out a square (preferably at least 12 x 12 in.) on the deposit or snow with the edge of a knife or tool.

If the snow surface is old and dirty, scrape a ~3 x 3 foot area before ash begins to fall.

Select an area in an open space where ash has directly fallen away from trees or other obstructions or if you know an ash cloud is coming your way and you plan toĬollect it from snow, be sure the snow is clean.

Procedure for Collecting Ash Samples After Ash Fall Figure 1: Collection of measured-area tephra samples from snowpack after the 1992 eruption of Crater Peak/ Mount Spurr, AK (photo taken on September 24, 1992).

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