Estimated Pleistocene slip rate for the San Simeon fault zone, south-central coastal California

Abstract. The Metropolitan District of Quito is divided into five areas: south, south-central, central, north-central and north. It is located on or very close to segments of reverse blind faults: Puengasí, Ilumbisí-La Bota, Carcelen-El Inca, Bellavista-Catequilla and Tangahuilla as indicated in Alvarado et al. (2014), making it one of the most seismically dangerous cities in the world. For each of the urban areas of Quito, elastic response spectra are presented in this paper, which are found using some of the new models of the PEER's NGA-West2 Program, models developed by: Abrahamson et al. (2013), Campbell and Borzognia (2013), and Chiou and Youngs (2013). These spectra are calculated considering the maximum amount that could be generated by the rupture of each fault segments, and taking into account the soil type that exists in each zone according to the Norma Ecuatoriana de la Construcción 2015 (NEC-15). Subsequently, the recurrence period of earthquakes of high magnitude in each fault segment is determined from the physical parameters of the fault segments (size of the fault plane and slip rate), and considering that the fault can break in earthquakes of magnitude less than the expected maximum (minimum size 5.0 Mw). For this, the pattern of recurrence of type GR earthquakes (Gutenberg and Richter, 1944) with double truncation magnitude (Mmin and Mmax) proposed by Cosentino et al. (1977) is used.

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Supplemental Material: Quaternary slip rates on the White Mountains fault zone, eastern California: Implications for comparing geologic to geodetic slip rates across the Walker Lane

10.1130/gsab.s.12252755 ◽

2020 ◽

Author(s):

Zachery M. Lifton

Keyword(s):

Fault Zone ◽

Depth Profile ◽

Slip Rate ◽

White Mountains ◽

Slip Rates ◽

Walker Lane ◽

Profile Modeling

Field photographs, stratigraphic columns, displacement modeling results, depth profile modeling results, and slip rate modeling results.

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Supplemental Material: Quaternary slip rates on the White Mountains fault zone, eastern California: Implications for comparing geologic to geodetic slip rates across the Walker Lane

10.1130/gsab.s.12252755.v1 ◽

2020 ◽

Author(s):

Zachery M. Lifton

Keyword(s):

Fault Zone ◽

Depth Profile ◽

Slip Rate ◽

White Mountains ◽

Slip Rates ◽

Walker Lane ◽

Profile Modeling

Field photographs, stratigraphic columns, displacement modeling results, depth profile modeling results, and slip rate modeling results.

Download Full-text

Paleoseismic and Slip-Rate Observations along the Honey Lake Fault Zone, Northeastern California, USA

Bulletin of the Seismological Society of America ◽

10.1785/0120070090 ◽

2008 ◽

Vol 98 (4) ◽

pp. 1730-1736 ◽

Cited By ~ 10

Author(s):

R. Turner ◽

R. D. Koehler ◽

R. W. Briggs ◽

S. G. Wesnousky

Keyword(s):

Fault Zone ◽

Slip Rate

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Surface faulting along the Superstition Hills fault zone and nearby faults associated with the earthquakes of 24 November 1987

Bulletin of the Seismological Society of America ◽

10.1785/bssa0790020252 ◽

1989 ◽

Vol 79 (2) ◽

pp. 252-281

Author(s):

R. V. Sharp ◽

K. E. Budding ◽

J. Boatwright ◽

M. J. Ader ◽

M. G. Bonilla ◽

...

Keyword(s):

Fault Zone ◽

Lateral Displacement ◽

Vertical Displacement ◽

Repeated Measurements ◽

The South ◽

Surface Rupture ◽

Imperial Valley ◽

The North ◽

South Central ◽

The Right

Abstract The M 6.2 Elmore Desert Ranch earthquake of 24 November 1987 was associated spatially and probably temporally with left-lateral surface rupture on many northeast-trending faults in and near the Superstition Hills in western Imperial Valley. Three curving discontinuous principal zones of rupture among these breaks extended northeastward from near the Superstition Hills fault zone as far as 9 km; the maximum observed surface slip, 12.5 cm, was on the northern of the three, the Elmore Ranch fault, at a point near the epicenter. Twelve hours after the Elmore Ranch earthquake, the M 6.6 Superstition Hills earthquake occurred near the northwest end of the right-lateral Superstition Hills fault zone. Surface rupture associated with the second event occurred along three strands of the zone, here named North and South strands of the Superstition Hills fault and the Wienert fault, for 27 km southeastward from the epicenter. In contrast to the left-lateral faulting, which remained unchanged throughout the period of investigation, the right-lateral movement on the Superstition hills fault zone continued to increase with time, a behavior that was similar to other recent historical surface ruptures on northwest-trending faults in the Imperial Valley region. We measured displacements over 339 days at as many as 296 sites along the Superstition Hills fault zone, and repeated measurements at 49 sites provided sufficient data to fit with a simple power law. Data for each of the 49 sites were used to compute longitudinal displacement profiles for 1 day and to estimate the final displacement that measured slips will approach asymptotically several years after the earthquakes. The maximum right-lateral slip at 1 day was about 50 cm near the south-central part of the North strand of Superstition Hills fault, and the predicted maximum final displacement is probably about 112 cm at Imler Road near the center of the South strand of the Superstition Hills fault. The overall distributions of right-lateral displacement at 1 day and the estimated final slip are nearly symmetrical about the midpoint of the surface rupture. The average estimated final right-lateral slip for the Superstition Hills fault zone is about 54 cm. The average left-lateral slip for the conjugate faults trending northeastward is about 23 cm. The southernmost ruptured member of the Superstition Hills fault zone, newly named the Wienert fault, extends the known length of the zone by about 4 km. The southern half of this fault, south of New River, expressed only vertical displacement on a sinuous trace. The maximum vertical slip by the end of the observation period there was about 25 cm, but its growth had not ceased. Photolineaments southeast of the end of new surface rupture suggest continuation of the Superstition Hills fault zone in farmland toward Mexico.

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