Keith Sverdrup's Research
My research involves the relocation of historic earthquakes that have occurred in relatively remote regions where the azimuthal distribution of recording stations is poor, leading to in accurate relative and absolute locations. The most recent work has involved earthquakes along the Blanco Transform Fault separating the Pacific and Juan de Fuca plates off the northwest coast of the United States. Earthquakes in this region have historically been mislocated to the northeast due to the poor azimuth distribution of stations. Events along the transform are typically in the magnitude 5.5 or less range, small enough that only stations in the narrow azimuthal range from about 0 to 135 degrees record them well. This one-sided distribution of stations results in computed locations that are routinely tens of kilometers to the northeast of the actual locations.
I have also worked on events in the Himalayas with Professor Cronin of Baylor University. My relocation methodology involves first grouping nearby events into clusters and then jointly relocating all of the events in a single cluster to mitigate the effects of errors that are common to all of them.
In addition, I am currently revising one of my oceanography textbooks: An Introduction to the World's Oceans, 8ed. by Sverdrup, Duxbury, and Duxbury. McGraw-Hill Higher Education Publishing.