Hawaiian Volcano Observatory

Horizontal displacement of GPS benchmarks
on Mauna Loa and Kilauea volcanoes, Hawai`i

Map showing displacement vectors between 1999 and 2001 on Mauna Loa and Kilauea volcanoes, Hawaii
Map showing direction and amount of horizontal displacement (blue vectors) of GPS stations on Mauna Loa and Kilauea volcanoes relative to a permanent GPS station located on Mauna Kea (north of Mauna Loa) between June 2000 and July 2001. Red vectors show GPS stations surveyed in 1999 and 2001. Error ellipses (two standard deviations or 95 percent confidence interval) are indicated at head of each vector.

The patterns of movement on both volcanoes are similar to those measured during the past several years. The south flank of Kilauea moved seaward a maximum of 7 cm at Kaena Point, and sites in the summit caldera moved 2-4 cm southeastward. 

GPS sites on Mauna Loa moved little by comparison. A few sites on the southeast flank moved as much as 1-3 cm southeastward.

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Updated : 16 October 2001 (srb)