ltd is the name of the trading company for Roger Musson. It deals in consultancy on matters relating to earthquakes and earthquake hazards, especially in a review capacity, and especially dealing with seismic hazard, historical earthquakes and macroseismology.

Roger Musson has over 35 years of experience in seismology, formerly working for the British Geological Survey as Head of Seismic Hazard and Archives. As well as private consultancy, he retains honorary positions at both BGS and the University of Edinburgh. He is the author of the historical earthquake catalogue for the UK, maintained by BGS, and is responsible for the development and popularisation of Monte Carlo simulations as a means of calculating probabilistic seismic hazard.

He is also author of the book "The Million Death Earthquake", a popular guide to earthquakes and seismology, published by Macmillan in 2012. He is well-known as a public speaker and broadcaster.

This site also hosts the web pages for the ESC Working Group "Internet Macroseismology" - see the navigation bar to the left.