Abstract
Changing patterns of seismicity and surface deformation indicate that magma is being injected and stored in a shallow reservoir beneath the summit, and that the probability of an eruption is increased.Mauna Loa is a 4169‐m‐high shield volcano on the Island of Hawaii. Its latest two eruptions occurred on the southwest flank in 1950 [Macdonald, 1954] and, mainly within the summit caldera, in 1975 [Lockwood el al., 1976]. The oval summit caldera is 3 by 5 km in diameter, with cliffs as much as 180 m high (Figure 1). It is elongate in the direction of two principal rift zones that extend northeastward and southwestward from the summit. These rift zones, which are commonly vents for flank eruptions, form the gently sloping ridges that give Mauna Loa its Hawaiian name—Long Mountain.
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