Bridging the gap between seismically and geodetically detected slow earthquakes

Ide, Satoshi; Imanishi, Kazutoshi; Yoshida, Yasuhiro; Beroza, Gregory C.; Shelly, D. R.

doi:10.1029/2008gl034014

Cited by 117 publications

(215 citation statements)

References 20 publications

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“…The Cascadia SSEs, a slow earthquake sequence , and short-term SSEs (Sekine et al, 2010) all fall within the LogM 0 ∼ LogT trend. As pointed out by Ide et al (2008), the lower slope characteristic of data from a particular study or geographic region may represent an artifact, potentially reflecting the saturation of a fault parameter from limited observations or the methodology. preceded by longer intervals.…”

Section: Seismic Moment Versus Fault Areamentioning

confidence: 99%

“…Here we reassess this logarithmic scaling relationship by adding data of more recent SSEs (Fig. 3), including two slow earthquake sequences in Japan (data from Ide et al, 2008 andSekine et al, 2010). Note that there is a lack of observations in our dataset for seismic moment within ∼1:0e15 1:0e17 N·m corresponding to duration ranging from minutes to days.…”

Section: Seismic Moment Versus Fault Areamentioning

confidence: 99%

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Scaling Relationships of Source Parameters for Slow Slip Events

Gao

Schmidt

Weldon

2012

Bulletin of the Seismological Society of America

108

169

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To better understand the physical mechanisms of slow slip events (SSEs) detected worldwide, we explore the scaling relationships of various source parameters and compare them with similar scaling laws for earthquakes. These scaling relationships highlight differences and similarities between slow slip events and earthquakes and hold implications for the degree of heterogeneity and fault-healing characteristics. The static stress drop remains constant for different-sized events as is observed for earthquakes. However, the static stress drop of slow slip events is within a range of 0.01-1.0 MPa, 1-2 orders of magnitude lower than that found for earthquakes, which could be related to the low stress state on the fault. The average rupture velocity, ranging from kilometers per second to kilometers per day, decreases linearly with increasing seismic moment in log-log space, unlike earthquakes that are nearly constant. This inverse relationship of rupture velocity with seismic moment could be related to the heterogeneity of fault properties. Slow slip events typically have ratios of event duration over dislocation rise time less than 3, while earthquakes have ratios greater than 3. This indicates that slow slip events are less pulselike than earthquakes in their mode of propagation and suggests that the healing behind the rupture front is delayed. The recurrence statistics of slow slip events on the northern Cascadia subduction zone are weakly time predictable and moderately antislip predictable (that is, the event size and preevent recurrence interval are anticorrelated), which may indicate that healing between events strengthens the fault with time.

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Section: Seismic Moment Versus Fault Areamentioning

confidence: 99%

Section: Seismic Moment Versus Fault Areamentioning

confidence: 99%

Scaling Relationships of Source Parameters for Slow Slip Events

Gao

Schmidt

Weldon

2012

Bulletin of the Seismological Society of America

108

169

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“…Slow slip events (SSEs) at various scales have been observed and studied in many regions worldwide over the past two decades (e.g., Linde et al 1996;Dragert et al 2001;Obara 2002;Kostoglodov et al 2003;Ide et al 2007aIde et al , 2008Ide 2012). It is considered that SSEs occur along the same interface as ordinary tectonic earthquakes (Ide et al 2007b), generally at the deeper extent of the shallow locked region, below the brittle-ductile transition.…”

Section: Introductionmentioning

confidence: 99%

Role of multiscale heterogeneity in fault slip from quasi-static numerical simulations

Aochi

Ide

2017

Earth Planets Space

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Quasi-static numerical simulations of slip along a fault interface characterized by multiscale heterogeneity (fractal patch model) are carried out under the assumption that the characteristic distance in the slip-dependent frictional law is scale-dependent. We also consider slip-dependent stress accumulation on patches prior to the weakening process. When two patches of different size are superposed, the slip rate of the smaller patch is reduced when the stress is increased on the surrounding large patch. In the case of many patches over a range of scales, the slip rate on the smaller patches becomes significant in terms of both its amplitude and frequency. Peaks in slip rate are controlled by the surrounding larger patches, which may also be responsible for the segmentation of slip sequences. The use of an explicit slip-strengthening-then-weakening frictional behavior highlights that the strengthening process behind small patches weakens their interaction and reduces the peaks in slip rate, while the slip deficit continues to accumulate in the background. Therefore, it may be possible to image the progress of slip deficit at larger scales if the changes in slip activity on small patches are detectable.

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“…This suggests that the group of LFEs is different to the group of ordinary earthquakes and that the scaled energy (i.e., the ratio of seismic energy to seismic moment) of the LFEs is much smaller than that of ordinary earthquakes. In the Kii Peninsula of southwest Japan, the envelope of tremors with high frequency (2-8 Hz) is proportional to that of low frequency (0.005-0.500 Hz) and the moment rate function, and the scaled energy is of the order of four to five times smaller than ordinary earthquakes (Ide et al 2008). The envelope of the LFEs is also similar to the VLFEs at IGK (Fig.…”

Section: Maximum Amplitudes Of Lfe-vlfes and Ordinary Earthquakesmentioning

confidence: 53%

“…2c-e). Calculating the seismic energy using the equation for the RMS waveform of LFEs (Ide et al 2008), and calculating the seismic moment using the empirical equation for the maximum amplitude and moment magnitude (Ando et al 2012), suggested that the scaled energy was of the order of 10 −11 for the three events shown in Fig. 2c-e.…”

Section: Maximum Amplitudes Of Lfe-vlfes and Ordinary Earthquakesmentioning

confidence: 99%

Distribution of low-frequency earthquakes accompanying the very low frequency earthquakes along the Ryukyu Trench

Nakamura

2017

Earth Planets Space

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This study investigated the activity and distribution of low-frequency earthquakes (LFEs) accompanying the very low frequency earthquakes (VLFEs) in the central and southern Ryukyu Trench. This investigation was based on shortperiod seismometer waveforms obtained by the Japan Meteorological Agency from April 2004 to December 2015. The LFEs were detected using the Envelope Correlation Method, and the hypocenter locations were established using the arrival time difference of the envelope. The arrival times of the P-and S-phases were selected for events in which conspicuous P and S arrivals were observed and their hypocenters were determined. The results showed that LFEs are distributed 30-50 km from the trench axis in the Okinawa and Yaeyama areas. These areas correspond to a slab depth of 12-25 km. The LFEs and VLFEs occurred in association with slow slip events (SSEs) in the Okinawa and Yaeyama areas, indicating that they are induced by SSEs in the Ryukyu Trench. Moreover, the SSEs, LFE-VLFEs, and thrust-type ordinary earthquakes exhibit separate distributions. This suggests change in the frictional condition at the slab depth of 12-25 km along the trench axis in the Ryukyu subduction zone. In the southern Ryukyu Trench, LFEs occur approximately 50 km from the SSE faults, suggesting that SSEs trigger the LFEs near the southern Ryukyu Trench.

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Bridging the gap between seismically and geodetically detected slow earthquakes

Cited by 117 publications

References 20 publications

Scaling Relationships of Source Parameters for Slow Slip Events

Scaling Relationships of Source Parameters for Slow Slip Events

Role of multiscale heterogeneity in fault slip from quasi-static numerical simulations

Distribution of low-frequency earthquakes accompanying the very low frequency earthquakes along the Ryukyu Trench

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