Aeromagnetic Map of Northeastern California

Scientific Investigations Map 3505
By:  and 



Aeromagnetic surveys were conducted to improve understanding of the geology and structure in northeastern California, a region predominantly covered by Quaternary and Tertiary, mainly Neogene, volcanic rocks including Medicine Lake volcano. New aeromagnetic data are a substantial improvement over existing data and reveal structural details not resolved by older surveys. Here we show how these data (1) do not support the presence of a northwest-striking structural feature across the Modoc Plateau, (2) reveal a northeast-striking fault-bounded block of predominantly reversely magnetized material that may influence tectonism at Medicine Lake volcano, and (3) constrain possible right-lateral offsets along the Likely Fault Zone and other faults that traverse the region. The data also highlight possible extensions of mapped faults, such as those in Fall River Valley and the Tule and Lower Klamath Lake areas.

Suggested Citation

Langenheim, V.E. and Sweetkind, D.S., 2023, Aeromagnetic map of northeastern California: U.S. Geological Survey Scientific Investigations Map 3505, pamphlet 21 p.,

ISSN: 2329-132X (online)

Study Area

Table of Contents

  • Acknowledgments
  • Abstract
  • Introduction
  • Data
  • Filtering and Magnetization Boundaries
  • Results
  • Description of Map Units
  • References Cited
Publication type Report
Publication Subtype USGS Numbered Series
Title Aeromagnetic map of northeastern California
Series title Scientific Investigations Map
Series number 3505
DOI 10.3133/sim3505
Year Published 2023
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) Geology, Minerals, Energy, and Geophysics Science Center, Geosciences and Environmental Change Science Center
Description Pamphlet: iv, 21 p.; 3 Data Releases; 1 Sheet: 30.82 × 39.53 inches
Country United States
State California
Additional Online Files (Y/N) Y
Google Analytic Metrics Metrics page
Additional publication details