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Photographic Documentation of the Evolution of Crater Glacier, Mount St. Helens, Washington, September 2006–November 2009

By Joseph S. Walder, Steven P. Schilling, David R. Sherrod, and James W. Vallance

ABSTRACT Lava-dome emplacement through a glacier was observed for the first time during the 2004–08 eruption of Mount St. Helens and documented using photography, photogrammetry, and geodetic measurements. Previously published reports present such documentation through September 2006; this report extends that documentation until November 2009.

First posted September 21, 2010 Report PDF (21.3 MB) Appendix 1: Animation of Evolution of Crater Glacier PDF (2.3 MB) This report is available only on the Web. For additional information: Contact CVO Volcano Science Center, Cascades Volcano Observatory U.S. Geological Survey 1300 SE Cardinal Court, Building 10, Suite 100 Vancouver, WA 98683-9589 http://vulcan.wr.usgs.gov/ Part of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.

Suggested citation:

Walder, J.S, Schilling, S.P., Sherrod, D.R., and Vallance, J.W., 2010, Evolution of Crater Glacier, Mount St. Helens, Washington, September 2006-November 2009: U.S. Geological Survey Open-File Report 2010-1141, 34 p. and animation.

Contents

Abstract

Introduction

Field Setting: Birth of Crater Glacier and its state in September 2006

Change in Crater Glacier since September 2006

The Future of Crater Glacier

Acknowledgments

References Cited

Appendix 1: Animation of Evolution of Crater Glacier