Author Archives: Marleen Nyst and Delphine Fitzenz

Marleen Nyst and Delphine Fitzenz

About Marleen Nyst and Delphine Fitzenz

Marleen Nyst

Senior Director, Model Development – RMS

Marleen leads the earthquake source modeling team for RMS earthquake models. For the RMS North America Earthquake Models release, Marleen oversaw the hazard component development and its validation.

Prior to RMS, Marleen worked as an Earth Sciences postdoctoral scholar for the USGS and at Stanford University. Marleen holds a master's in Geophysics from the University of Utrecht and a PhD from the Delft University of Technology, The Netherlands.

Delphine Fitzenz

Senior Principal Modeler, Model Development, RMS

Delphine works on earthquake source modeling for risk products, with a particular emphasis on spatio-temporal patterns of large earthquakes.

Since joining RMS in 2012 after 10+ years in academia, she has strived to bring the risk and the earthquake science communities closer together through her articles and by organizing special sessions at conferences. These include the Annual Meeting of the Seismological Society of America (e.g., Earthquake Hazards and Risk: Drivers and Consumers of Earthquake Research in 2015; Risk Management Applications of Earthquake Seismology in 2016).

She gave an invited talk on “How much spatio-temporal clustering should one build into a risk model?” at the Ninth Statistical Seismology workshop in Potsdam, Germany, and was invited to "Workshop 1: Potential Uses of Operational Earthquake Forecasting (OEF) System in California."

Did Ridgecrest Increase the Chances of a Large Seismic Event?

Interest in the 160-mile-long Garlock Fault, the second-largest fault in California, has been piqued recently after a Los Angeles Times article about deformation on the Garlock Fault due to the Ridgecrest sequence of events in July 2019. Since the publication of this article, RMS has received information requests focused around two main points.

First, does RMS believe that Ridgecrest impacted the Garlock Fault (and possibly others), and has therefore increased the probability of a rupture there? Second, does RMS support the assumption from the U.S. Geological Survey (USGS) that the most likely scenario is that the Ridgecrest quakes probably won’t trigger a larger earthquake, but have raised the chances of an earthquake of magnitude 7.5 or more on the nearby Garlock, Owens Valley, Blackwater and Panamint Valley faults over the next year. And how would RMS recommend that clients model and capture this increased risk?

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