Supplemental Material: Quaternary chronology and rock uplift recorded by marine terraces, Gaviota coast, Santa Barbara County, California, USA

Details of luminescence dating methods and results.

Supplemental Material: Quaternary chronology and rock uplift recorded by marine terraces, Gaviota coast, Santa Barbara County, California, USA

Details of luminescence dating methods and results.

Observations and Analyses of the 9 January 2018 Debris-Flow Disaster, Santa Barbara County, California

ABSTRACT The post–Thomas Fire debris flows of 9 January 2018 killed 23 people, damaged 558 structures, and caused severe damage to infrastructure in Montecito and Carpinteria, CA. U.S. Highway 101 was closed for 13 days, significantly impacting transportation and commerce in the region. A narrow cold frontal rain band generated extreme rainfall rates within the western burn area, triggering runoff-driven debris flows that inundated 5.6 km2 of coastal land in eastern Santa Barbara County. Collectively, this series of debris flows is comparable in magnitude to the largest documented post-fire debris flows in the state and cost over a billion dollars in debris removal and damages to homes and infrastructure. This study summarizes observations and analyses on the extent and magnitude of inundation areas, debris-flow velocity and volume, and sources of debris-flow material on the south flank of the Santa Ynez Mountains. Additionally, we describe the atmospheric conditions that generated intense rainfall and use precipitation data to compare debris-flow source areas with spatially associated peak 15 minute rainfall amounts. We then couple the physical characterization of the event with a compilation of debris-flow damages to summarize economic impacts.

2395. Analysis of Countywide Clostridium difficile Infection using Descriptive Statistics and Geographic Information Systems Mapping

Background Clostridium difficile infection (CDI) is now the most common pathogen causing nosocomial infectious diarrhea in the United States, and more than 500,000 people are estimated to have either healthcare-associated (HA) or community acquired (CA) CDI. The epidemiology of CDI is incompletely understood with more than 50% of all CDI cases occurring in the outpatient community and growing at a pace that is greater than HA-CDI. Methods Patients with CDI within Santa Barbara County, California were identified via three types of tests: Clostridium difficile PCR, gastrointestinal panel by PCR, and enzyme immunoassay (EIA) via local laboratory. Basic patient characteristics were analyzed using descriptive statistics. Changes with CA-CDI incidence were examined on a quarterly basis to identify and compare quarterly trends in CA-CDI incidence. Geographic Information Systems (GIS) mapping was utilized to provide better spatial understanding of disease distribution across communities. Results Over 2,000 unique patients with CDI were identified between January 1, 2013 and January 31, 2019. Median age of these patients was 64 years (interquartile range: 45 – 78) and 60% were female. Hot spots of CDI within Santa Barbara County were localized to three major cities: Santa Barbara, Goleta, and Lompoc. Our results show that based on seasonal quarterly data CDI occurred most frequently in winter months. Conclusion In conclusion, CDI hot spots occurred most frequently during winter months and could possibly be associated with increased antibiotic treatment during flu season. Using the results from this study, we believe that by utilizing spatial and seasonal trends associated with CDI, physicians may be able to identify, diagnose and treat patients with CDI more promptly in Santa Barbara County. Disclosures All authors: No reported disclosures.