Kinematics of Slow-Slip Events

King, Chi‐Yu

doi:10.5772/intechopen.84904

Cited by 4 publications

(3 citation statements)

References 108 publications

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“…Similar observations of kilometer‐long creep event ruptures have been identified using tiltmeters (Mchugh & Johnston, 1976) and strainmeters (Mortensen et al., 1977). Models to explain the physical processes controlling creep events have also invoked large along‐strike lengths (King, 2019; King et al., 1973; Nason & Weertman, 1973). However, those along‐strike extents are based primarily on observations of surface slip.…”

Section: Introductionmentioning

confidence: 99%

Scattered M3–4 Slip Bursts Within Creep Events on the San Andreas Fault

Gittins,

Hawthorne

2024

JGR Solid Earth

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Scientists have observed the surface expression of creep events along the San Andreas Fault since the 1960s. However, the evolution of slip at depth has been examined relatively little. So here we probe that deep slip by analyzing strain observations just before and during hours‐ to day‐long creep events at the northern end of the creeping section of the San Andreas Fault. We identify 71 strain offsets that are likely produced by few‐hour bursts of slip at depth. Then, we grid search to determine the location, depth, and magnitude of these slip bursts. We find that the slip bursts occur at a range of along‐strike locations, from 0 to 7 km away from the surface slip observations. Slip occurs at depths from 0 to 10 km; 42%–55% of the bursts are likely below 4 km depth. The bursts typically have moments equivalent to Mw 3.2–4.1 earthquakes. These findings suggest that creep events are not just small shallow events; they are relatively large events that nucleate at significant depths and could play a prominent role in the slip dynamics of the creeping section.

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Section: Introductionmentioning

confidence: 99%

Scattered M3–4 Slip Bursts Within Creep Events on the San Andreas Fault

Gittins,

Hawthorne

2024

JGR Solid Earth

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“…We do not know the spatial extent of most creep events because previous work has focused on a handful of larger events or repeated events at an individual creepmeter (e.g., Bilham & Behr, 1992; Evans et al., 1981; Gladwin et al., 1994; Goulty & Gilman, 1978; King et al., 1973; King, 2019; Mchugh & Johnston, 1976; Mortensen et al., 1977; Nason & Weertman, 1973; Slater & Burford, 1979). Furthermore, slip at an individual creepmeter tells us only about the slip at a particular location; it does not tell how much of the fault is slipping.…”

Section: Introductionmentioning

confidence: 99%

“…Some analyses have implied creep events are just short (640 m), shallow ruptures (30–510 m depth) (Figure 3a) (e.g., Gladwin et al., 1994; Goulty & Gilman, 1978; Mortensen et al., 1977) or long (6.6 km), shallow ruptures (510–1400 m depth) (Figure 3b) (e.g., Evans et al., 1981; Mchugh & Johnston, 1976). However, other evidence implies that creep events could be long and deep, rupturing to depths of 4 km, perhaps all the way to the seismogenic zone (Figure 3c) (e.g., Bilham et al., 2016; King, 2019; King et al., 1973; Mortensen et al., 1977).…”

Section: Introductionmentioning

confidence: 99%

Are Creep Events Big? Estimations of Along‐Strike Rupture Lengths

Gittins¹,

Hawthorne²

2022

JGR Solid Earth

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Segments of many faults are observed to slip aseismically at the surface. On the central segment of the San Andreas Fault, aseismic slip accumulates largely in creep events: few mm bursts of slip which occur every few weeks to months. But even though we have observed creep events worldwide since the 1960s, we still do not know how big most events are or which forces drive them. To address this uncertainty, we systematically identify creep events along the central San Andreas Fault and determine their along‐strike rupture extents. We first use cross‐correlation and visual inspection to identify events at individual creepmeters. With data from 18 USGS creepmeters, we identify 2120 records of creep events between 1985 and 2020. We then search for slip that is closely timed across multiple creepmeters. We identify 306 instances of closely timed slip, which could indicate 306 creep events that rupture multiple creepmeter locations. Through visual inspection and statistical analysis of timing, we identify a variety of creep event types, including single‐creepmeter events, small (<2 km) events, medium‐sized (3–6 km) events, large (>10 km) events, and events that rupture multiple fault strands. The existence of many large (> $ > $few‐km) events suggests that creep events are not produced by small, rainfall‐associated perturbations; they are more likely driven by complex or heterogeneous frictional weakening and they may provide a window into the dynamics of a larger scale slip on the San Andreas Fault.

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Water-Level and Stream-Flow Earthquake Precursors and Their Possible Mechanisms

King¹

2020

Preprint

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Kinematics of Slow-Slip Events

Cited by 4 publications

References 108 publications

Scattered M3–4 Slip Bursts Within Creep Events on the San Andreas Fault

Scattered M3–4 Slip Bursts Within Creep Events on the San Andreas Fault

Are Creep Events Big? Estimations of Along‐Strike Rupture Lengths

Water-Level and Stream-Flow Earthquake Precursors and Their Possible Mechanisms

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