The 1990 Kalapana flow field is a complex patchwork of tube-fed pahoehoe flows erupted from the Kupaianaha vent at a low effusion rate (approximately 3.5 m3/s). These flows accumulated over an 11-month period on the coastal plain of Kilauea Volcano, where the pre-eruption slope angle was less than 2°. the composite field thickened by the addition of new flows to its surface, as well as by inflation of these flows and flows emplaced earlier. Two major flow types were identified during the development of the flow field: large primary flows and smaller breakouts that extruded from inflated primary flows. Primary flows advanced more quickly and covered new land at a much higher rate than breakouts. The cumulative area covered by breakouts exceeded that of primary flows, although breakouts frequently covered areas already buried by recent flows. Lava tubes established within primary flows were longer-lived than those formed within breakouts and were often reoccupied by lava after a brief hiatus in supply; tubes within breakouts were never reoccupied once the supply was interrupted. During intervals of steady supply from the vent, the daily areal coverage by lava in Kalapana was constant, whereas the forward advance of the flows was sporadic. This implies that planimetric area, rather than flow length, provides the best indicator of effusion rate for pahoehoe flow fields that form on lowangle slopes.
[1]
M. Malin.
Lengths of Hawaiian lava flows
,
1980
.
[2]
M. S. Rao.
The Puu OO Eruption of Kilauea Volcano, Hawaii: Episodes 1 Through 20, January 3, 1983. Through June 8, 1984"
,
1990
.
[3]
S. Baloga,et al.
Eruption rate, area, and length relationships for some Hawaiian lava flows
,
1986
.
[4]
T. L. Wright,et al.
The Pu'u ‘O’o‐Kupaianaha Eruption of Kilauea
,
1991
.
[5]
J. P. Kauahikaua,et al.
Emplacement and inflation of pahoehoe sheet flows: observations and measurements of active lava flows on Kilauea volcano, Hawaii
,
1994
.