Reconnaissance map showing thickness of volcanic ash deposits in the greater Hilo area, Hawaii
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Abstract
This study was undertaken to determine the thickness and distribution of volcanic ash deposits in the greater Hilo area, Hawaii, as a step toward evaluating their susceptibility to failure during earthquake shaking. On several occasions their instability has resulted in serious damage. For example, the 1868 earthquake (m=7+), following a prolonged rainy period, caused a debris flow of hillside ash deposits that killed 31 people in Wood Valley (Bringham, 1869). The 1973 Honomu earthquake (m=6.2) resulted in more damage from shaking to areas underlain by ash deposits in the older part of Hilo than in other areas, and soil slips in ash, as well as rockfalls, were common along the roads north of town (Nielsen and others, 1977).
Three geologic units are represented on the accompanying map: the ash deposits, a clay bed that locally underlies the ash, and the bedrock material.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Reconnaissance map showing thickness of volcanic ash deposits in the greater Hilo area, Hawaii |
| Series title | Miscellaneous Field Studies Map |
| Series number | 1499 |
| DOI | 10.3133/mf1499 |
| Year Published | 1983 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Description | 28.40 x 28.25 inches |
| Country | United States |
| State | Hawai'i |
| City | Hilo |
| Scale | 24000 |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |