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WITHDRAWN Seismicity Characterisation in the Mount Cameroon Region

Description: 

WITHDRAWN Mount Cameroon is an active volcano rising to almost 4100 m above sea level on Cameroon's south-western coast on the Gulf of Guinea. Over the past century, it has experienced 7 major volcanic eruptions, the most recent of which occurred in 1999 and 2000. Its volcanic eruptions are usually preceded by a major seismic crisis, with seismicity rising from an average of 30 events in the quiescent period to over 100 events per month as an eruption approaches. At the end of the year 2010, over a period of almost 3 months, we witnessed an increase in seismicity, with a peak of just under 200 events reached in September, yet no eruption followed. In order to better understand the physical phenomena behind this crisis, we therefore proposed to use a seismological statistical approach, in this case the non-stationary ETAS model and the analysis of the magnitude distribution, to characterize this seismicity. The b value, considered as one of the important parameters representing the nature of earthquake occurrence and characterizing the state of stress in the crust was found to be high. The background rate, obtained from the inversion of the non-stationary ETAS parameters, reveals a slow transient deformation with gradual onset. The computation of the forcing rate show so far that almost 55% of the seismicity is due to an external process like fluid intrusion.

Session: Advanced Geophysical Observations, Analytical Methods, and New Insights for Earthquake Swarms [Poster]

Type: Poster

Date: 4/15/2025

Presentation Time: 08:00 AM (local time)

Presenting Author: Delair Dieudonne

Student Presenter: No

Invited Presentation: 

Poster Number: 116

Authors