Interactions between earthquakes and volcano activity

Abstract

[1] Using the 1973-2005 worldwide catalogues for M ! 4.8 seismicity and VEI ! 0 volcano eruptions, we find a significant, when tested against catalogue randomizations, increase of eruption onsets on the earthquake day. This result emerges from stacking time series of daily eruption rates relatively to earthquake time, t 0 , over the whole seismicity catalogue. It is stronger for earthquake-volcano pairs for which the volcano is within ten rupture size from the epicenter. These results show that M ! 4.8 À VEI ! 0 earthquake-volcano pairs are as important for interaction processes as the M ! 7 and VEI ! 2-5 pairs previously reported to interact. The clustering in time for earthquakeeruption pairs is not bounded to t 0 . It remains above the background noise 6-10 days before and after t 0 , and follows a power law distribution. These patterns, which are similar to the direct and inverse Omori's laws observed for tectonic earthquakes, are the first evidence for the volcano eruptions to be contemporary of a stochastic brittle damage in the earth crust. The clustering we observe in time and space (i) rejects the earthquake triggering as the single process that drive earthquake-volcano interactions; (ii) supports a regional tectonic coupling in the earth crust damage. Citation: Lemarchand, N., and J.-R. Grasso (2007),Interactions between earthquakes and volcano activity, Geophys.

Earthquake triggering of mud volcanoes

“…Darwin, 1840). Earthquake and eruption catalogs provide statistical support for the occurrence of long-distance triggering; both Linde and Sacks (1998) and Lemarchand and Grasso (2007) found that volcanic eruptions occur more frequently in the few days following large earthquakes. Reviews of proposed mechanisms for short-term dynamic triggering of volcanic eruptions are given by Hill et al (2002) and Manga and Brodsky (2006).…”

“…The ongoing eruption, now known as ''Lusi'', covers an area of 6.5 km 2 and has displaced tens of Lemarchand and Grasso (2007), Manga and Brodsky (2006), Mellors et al (2007), Montgomery and Manga (2003), Wang et al (2006) with additional mud volcanoes eruptions reported in Delisle (2005), Snead (1964), Ambraseys and Bilham (2003), Deville (submitted for publication), Bonini (submitted for publication) and Rukavickova and Hanzl (2008). The solid and dotted lines are the empirical liquefaction limit and error, respectively, determined by Wang et al (2006).…”

Tectonic control over active volcanism at a range of scales: Case of the Rungwe Volcanic Province, SW Tanzania; and hazard implications

“…600 houses and affected more than 6000 persons despite its moderate strength. Lemarchand and Grasso (2007) showed that moderate earthquakes of magnitude M P 4.8 are capable of triggering eruptions at volcanoes within a distance from the earthquake less than ten times the fault length. Although the chance of such an earthquake-eruption interaction is small (0.3%), it is not unlikely to occur in this study area which shows strong volcano-tectonic interactions.…”

Hydrologic Responses to Earthquakes and a General Metric

“…where q is density, and T i and v i are the period and particle velocity of the ith mode, and the sum is taken over all Lemarchand & Grasso (2007) modes for ground motion. For an earthquake of magnitude M, the seismic energy density e at a distance r from the earthquake source may be estimated from the empirical relation (Wang 2007) log r ¼ 0:48M À 0:33 log e À 1:4; ð2Þ where r is in km and e in J m )3 .…”