1978 Santa Barbara earthquake

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1978 Santa Barbara (Goleta) earthquake
Santabarbara1978.jpg
The derailment of a freight train,
caused by the earthquake
Relief map of California.png
Green pog.svg
Los Angeles
Bullseye1.png
UTC  time1978-08-13 22:54:52
ISC  event 677997
USGS-ANSS ComCat
Local dateAugust 13, 1978
Local time15:54:52 PDT
Magnitude5.1 ML
5.6 Mw [1]
Depth8.8 km (5.5 mi)
Epicenter 34°11′N118°15′W / 34.18°N 118.25°W / 34.18; -118.25 Coordinates: 34°11′N118°15′W / 34.18°N 118.25°W / 34.18; -118.25
Faultunknown
Type Thrust
Total damage$15 million (1978 rate) in damages
Max. intensity VII (Very strong)
Peak acceleration0.23−0.94 g [2] [3]
Casualties65 injuries

The 1978 Santa Barbara earthquake (also known as the Goleta earthquake), occurred on August 13, 1978, 3:54 p.m. (PDT) with its epicenter beneath the Santa Barbara Channel. [4] [5] The magnitude of the earthquake was estimated at ML 5.1 according to the Southern California Seismic Network, however it may have been as high as 5.6 Mw . [1] No lives were lost from the event, however 65 people sustained mild to moderate injuries. [6]

Contents

Tectonic Setting

Santa Barbara is part of California, which is known for its very high level of seismic activity, the second highest in all of the United States only behind Alaska. [7] The Santa Barbara area is affected by numerous faults, inland within the mountainous ridges on the Santa Ynez Range down to the coastal plains and beneath the Santa Barbara Channel. [8] The Santa Barbara Channel lies within the Transverse Ranges block where the transform boundary between the North American and Pacific Plates takes on a transpressional character associated with the "Big Bend" in the San Andreas Fault. The faults beneath the channel trend mainly west–east and are mainly thrusts with associated folding. [9] Santa Barbara was previously hit by a much larger earthquake in 1925, with estimated magnitude between 6.5−6.8 Mw , causing $8 million (1925 rate) in damage and killing 13 people. [10]

Earthquake

According to initial records it measured 5.1–5.7 ML  and is still being debated today. The fault that caused the tremor has still been unidentified however surface ruptures were found facing Northwestward around the epicenter focused beneath the Santa Barbara Channel. Seismograph monitors in the campus of the University of California, Santa Barbara (UCSB) measured 0.45 g, another monitor at the top of the North hall on the other hand recorded accelerations as high as 0.94 g. [11] Other local seismographs claim that 0.40 g was recorded in Goleta and only 0.23 g was recorded in Santa Barbara. [12] Coincidentally, just a day before the earthquake struck, four seismographs were installed near the most affected areas. The newly installed instruments helped determine the focal mechanism; thrust faulting with a small component of left-lateral strike-slip. [6] [13]

Damage

Despite having a relatively moderate magnitude, it generated unusually strong ground movements. [14] The city of Goleta suffered the greatest damage due to its location nearest to the epicenter. Items were thrown out off shelves at shops, glass windows on buildings shattered, walls cracked and one roof reportedly collapsed. Rockslides were triggered, one of them blocking California State Route 154, 5 km southeast of the San Marcos Pass, forcing a closure for 30 hours. Other landslides occurred nearby the San Marcos Pass, and along south of U.S. Highway 101. [15] The airport terminal at the Santa Barbara Municipal Airport leaned, and a nearby freight train from Goleta derailed. [6] At the library of the UCSB, some 400,000 volumes or about one third of all books were thrown out of shelves. The total damage was at $15 million, in the UCSB it was at $5.5 million alone. [11] [6]

See also

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References

  1. 1 2 Hough, S.E.; Martin, S.S. (2018). "A proposed rupture scenario for the 1925 MW 6.5 Santa Barbara, California, earthquake". Tectonophysics. 747–748: 211–224. doi:10.1016/j.tecto.2018.09.012.
  2. ↑ "1978 Santa Barbara Earthquake: In Brief". projects.eri.ucsb.edu. Retrieved 2021-10-27.
  3. ↑ "The Santa Barbara earthquake of 13 august, 1978". Wiley Online Library. Retrieved 2021-10-28.
  4. ↑ Modugno, Tom (2014-10-19). "Goleta Earthquake 1978". Goleta History. Retrieved 2021-10-28.
  5. ↑ "M 5.1 - 12km S of Santa Barbara, CA". earthquake.usgs.gov. Archived from the original on 2021-06-24. Retrieved 2021-10-28.
  6. 1 2 3 4 "Southern California Earthquake Data Center at Caltech". scedc.caltech.edu. Retrieved 2021-11-13.
  7. ↑ "The Most Common States for Earthquakes (And How You Can Stay Safe) – Apartment Living Tips – Apartment Tips from ApartmentGuide.com". www.apartmentguide.com. Retrieved 2021-10-28.
  8. ↑ Liddicoat, J. C. (1990-09-01). "Tectonic rotation of the Santa Ynez Range, California, recorded in the Sespe Formation". Geophysical Journal International. 102 (3): 739–745. doi:10.1111/j.1365-246X.1990.tb04592.x. ISSN   0956-540X.
  9. ↑ "Chapter 2: Tectonic History of the Transverse Ranges: Rotation and Deformation on the Plate Boundary | Education at the Center for Watershed Sciences". watershed.ucdavis.edu. Retrieved 2021-11-13.
  10. ↑ Scott Harrison (2019-06-28). "From the Archives: The 1925 Santa Barbara earthquake". Los Angeles Times. Archived from the original on 2019-06-28. Retrieved 2021-10-28.
  11. 1 2 "1978 Santa Barbara Earthquake: In Brief". projects.eri.ucsb.edu. Retrieved 2021-10-28.
  12. ↑ Miller, Richard K. (1979). "The Santa Barbara earthquake of 13 august, 1978". Earthquake Engineering & Structural Dynamics. 7 (5): 491–506. doi:10.1002/eqe.4290070508. ISSN   1096-9845.
  13. ↑ "M 5.1 - 12km S of Santa Barbara, CA: Focal Mechanism". earthquake.usgs.gov. Archived from the original on 2021-11-13. Retrieved 2021-10-28.
  14. ↑ "Untitled - Desastres (CIDBIMENA)" (PDF). cidbimena.desastres.hn.
  15. ↑ "ARTIFICIAL AND NATURAL SLOPE FAILURES, THE SANTA BARBARA EARTHQUAKE OF AUGUST 13, 1978". www.johnmartin.com. Retrieved 2021-11-13.
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