The 1998 Casita volcano flank failure revisited - New insights into geological setting and failure mechanisms

The fact that future events can affect some remaining settlements and the segment of the Pan American Highway, between Chinandega and León, motivated an analysis of the stability of the remaining slope using parameters calibrated in the back-analyses of the 1998 flank failure. The results indicated that the remaining slope is stable as long as groundwater levels in the northern and southern area are deeper than 65 m and 90 m respectively (relative to the points of maximum elevation on the analysed section) and the colluvium deposits in the southern area are not removed from the toe of the slope.