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Cited by 173

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Historical patterns of wildfire ignition sources in California ecosystems

Open access
Keeley, Jon E., Syphard, Alexandra D.·2018·International Journal of Wildland Fire

Abstract

State and federal agencies have reported fire causes since the early 1900s, explicitly for the purpose of helping land managers design fire-prevention programs. We document fire-ignition patterns in five homogenous climate divisions in California over the past 98 years on state Cal Fire protected lands and 107 years on federal United States Forest Service lands. Throughout the state, fire frequency increased steadily until a peak c. 1980, followed by a marked drop to 2016. There was not a tight link between frequency of ignition sources and area burned by those sources and the relationships have changed over time. Natural lightning-ignited fires were consistently fewer from north to south and from high to low elevation. Throughout most of the state, human-caused fires dominated the record and were positively correlated with population density for the first two-thirds of the record, but this relationship reversed in recent decades. We propose a mechanistic multi-variate model of factors driving fire frequency, where the importance of different factors has changed over time. Although ignition sources have declined markedly in recent decades, one notable exception is powerline ignitions. One important avenue for future fire-hazard reduction will be consideration of solutions to reduce this source of dangerous fires.

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Metadata

Authors
Keeley, J. E., & Syphard, A. D.
Venue
International Journal of Wildland Fire
Published
2018-11-07
Volume
27
Issue
12
Pages
781-799
ISSN
  • 1049-8001 (ISSN-L)
  • 1448-5516
OpenAlex
W2899831659
Cited by
173
References
8
FWCI
6.04
Type
journal article
Language
en
Open access
hybrid

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CoChat. (2026). Citation check: Historical patterns of wildfire ignition sources in California ecosystems. https://app.cochat.ai/papers/10.1071/wf18026
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Keeley, J. E., & Syphard, A. D. (2018). Historical patterns of wildfire ignition sources in California ecosystems. International Journal of Wildland Fire. https://doi.org/10.1071/wf18026

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.