Reassessment of a slip budget along the Parkfield segment of the San Andreas fault

Nathan A. Toké, Ramon Arrowsmith

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Historically, the Parkfield segment has represented a transition in fault behavior along the San Andreas fault (SAP). Despite a ∼33 mm/yr long-term slip rate along the SAP, slip has not been observed on the Cholame segment since the great 1857 Fort Tejón earthquake. During that time, the Parkfield segment has experienced slip from at least six ∼M 6.0 earthquakes, aseismic fault creep, and from minor earthquakes. Data from aseismic slip-rate studies and historical earthquake studies allow us to estimate the total slip released along this portion of the SAP since 1857. Assuming the SAF should slip at the long-term slip rate, a slip deficit of ∼5 m exists along the Cholame segment since 1857. The slip deficit is approximately equivalent to 1857 offsets measured on the Cholame and the southeast portion of the Parkfield segment. Thus, the slip deficit in southeast Parkfield and Cholame may be as great as the slip accommodated along these segments in 1857. The slip deficit abruptly decreases to the northwest across the Parkfield segment. It is < 2 m near the town of Parkfield and ∼0 m northwest of Middle Mountain. An ∼M 7 event rupturing all or part of the Cholame segment and the southeastern Parkfield segment (slip decreasing to the northwest) would release the accumulated slip and is plausible. Importantly, this study also shows that the change in the pattern of strain release occurs in the middle of the Parkfield segment, rather than at its ends.

Original languageEnglish (US)
JournalBulletin of the Seismological Society of America
Volume96
Issue number4 B
DOIs
StatePublished - 2006

Fingerprint

San Andreas Fault
budgets
Earthquakes
slip
slip rate
earthquake
earthquakes
Creep
budget
rupturing
creep
mountains

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Reassessment of a slip budget along the Parkfield segment of the San Andreas fault. / Toké, Nathan A.; Arrowsmith, Ramon.

In: Bulletin of the Seismological Society of America, Vol. 96, No. 4 B, 2006.

Research output: Contribution to journalArticle

@article{f861dcbf94004eb4b338f95e91f1504f,
title = "Reassessment of a slip budget along the Parkfield segment of the San Andreas fault",
abstract = "Historically, the Parkfield segment has represented a transition in fault behavior along the San Andreas fault (SAP). Despite a ∼33 mm/yr long-term slip rate along the SAP, slip has not been observed on the Cholame segment since the great 1857 Fort Tej{\'o}n earthquake. During that time, the Parkfield segment has experienced slip from at least six ∼M 6.0 earthquakes, aseismic fault creep, and from minor earthquakes. Data from aseismic slip-rate studies and historical earthquake studies allow us to estimate the total slip released along this portion of the SAP since 1857. Assuming the SAF should slip at the long-term slip rate, a slip deficit of ∼5 m exists along the Cholame segment since 1857. The slip deficit is approximately equivalent to 1857 offsets measured on the Cholame and the southeast portion of the Parkfield segment. Thus, the slip deficit in southeast Parkfield and Cholame may be as great as the slip accommodated along these segments in 1857. The slip deficit abruptly decreases to the northwest across the Parkfield segment. It is < 2 m near the town of Parkfield and ∼0 m northwest of Middle Mountain. An ∼M 7 event rupturing all or part of the Cholame segment and the southeastern Parkfield segment (slip decreasing to the northwest) would release the accumulated slip and is plausible. Importantly, this study also shows that the change in the pattern of strain release occurs in the middle of the Parkfield segment, rather than at its ends.",
author = "Tok{\'e}, {Nathan A.} and Ramon Arrowsmith",
year = "2006",
doi = "10.1785/0120050829",
language = "English (US)",
volume = "96",
journal = "Bulletin of the Seismological Society of America",
issn = "0037-1106",
publisher = "Seismological Society of America",
number = "4 B",

}

TY - JOUR

T1 - Reassessment of a slip budget along the Parkfield segment of the San Andreas fault

AU - Toké, Nathan A.

AU - Arrowsmith, Ramon

PY - 2006

Y1 - 2006

N2 - Historically, the Parkfield segment has represented a transition in fault behavior along the San Andreas fault (SAP). Despite a ∼33 mm/yr long-term slip rate along the SAP, slip has not been observed on the Cholame segment since the great 1857 Fort Tejón earthquake. During that time, the Parkfield segment has experienced slip from at least six ∼M 6.0 earthquakes, aseismic fault creep, and from minor earthquakes. Data from aseismic slip-rate studies and historical earthquake studies allow us to estimate the total slip released along this portion of the SAP since 1857. Assuming the SAF should slip at the long-term slip rate, a slip deficit of ∼5 m exists along the Cholame segment since 1857. The slip deficit is approximately equivalent to 1857 offsets measured on the Cholame and the southeast portion of the Parkfield segment. Thus, the slip deficit in southeast Parkfield and Cholame may be as great as the slip accommodated along these segments in 1857. The slip deficit abruptly decreases to the northwest across the Parkfield segment. It is < 2 m near the town of Parkfield and ∼0 m northwest of Middle Mountain. An ∼M 7 event rupturing all or part of the Cholame segment and the southeastern Parkfield segment (slip decreasing to the northwest) would release the accumulated slip and is plausible. Importantly, this study also shows that the change in the pattern of strain release occurs in the middle of the Parkfield segment, rather than at its ends.

AB - Historically, the Parkfield segment has represented a transition in fault behavior along the San Andreas fault (SAP). Despite a ∼33 mm/yr long-term slip rate along the SAP, slip has not been observed on the Cholame segment since the great 1857 Fort Tejón earthquake. During that time, the Parkfield segment has experienced slip from at least six ∼M 6.0 earthquakes, aseismic fault creep, and from minor earthquakes. Data from aseismic slip-rate studies and historical earthquake studies allow us to estimate the total slip released along this portion of the SAP since 1857. Assuming the SAF should slip at the long-term slip rate, a slip deficit of ∼5 m exists along the Cholame segment since 1857. The slip deficit is approximately equivalent to 1857 offsets measured on the Cholame and the southeast portion of the Parkfield segment. Thus, the slip deficit in southeast Parkfield and Cholame may be as great as the slip accommodated along these segments in 1857. The slip deficit abruptly decreases to the northwest across the Parkfield segment. It is < 2 m near the town of Parkfield and ∼0 m northwest of Middle Mountain. An ∼M 7 event rupturing all or part of the Cholame segment and the southeastern Parkfield segment (slip decreasing to the northwest) would release the accumulated slip and is plausible. Importantly, this study also shows that the change in the pattern of strain release occurs in the middle of the Parkfield segment, rather than at its ends.

UR - http://www.scopus.com/inward/record.url?scp=33845721806&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33845721806&partnerID=8YFLogxK

U2 - 10.1785/0120050829

DO - 10.1785/0120050829

M3 - Article

AN - SCOPUS:33845721806

VL - 96

JO - Bulletin of the Seismological Society of America

JF - Bulletin of the Seismological Society of America

SN - 0037-1106

IS - 4 B

ER -