Moment and duration of shallow earthquakes from Love-wave modelling for regional distances

Brüstle, Wolfgang; Müller, Gerhard

doi:10.1016/0031-9201(83)90031-6

Cited by 42 publications

(15 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The total geometric moment of Model 3 amounts to 2.0 × 10 9 m 3 , and using a value for shear rigidity appropriate to basement rocks G b (see Table 1), this corresponds to a seismic moment of approximately 4.0 × 10 26 dyne cm. These values are in close agreement with the geodetic estimate of Ruegg et al [1982] and the seismic estimates by Yielding [1985], Deschamps et al [1982] and Brustle and Muller [1983].…”

Section: Results From Forward Elastic Dislocation Modeling Of the 198supporting

confidence: 91%

Fracture prediction for the 1980 El Asnam, Algeria earthquake via elastic dislocation modeling

Healy

Yielding²,

Kusznir

2004

Tectonics

View full text Add to dashboard Cite

earthquake via elastic dislocation modeling. ', Tectonics., 23 (6). TC6005.Further information on publisher's website: Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. [1] Geomechanical models based on linear elasticity have been used to predict the mode and distribution of subseismic fractures around larger faults. These models can be tested against field observations of surface breaks (fractures) formed in the aftermath of large earthquakes. This paper presents forward models based on elastic dislocation theory of the deformation due to the M s 7.3 earthquake at El Asnam, Algeria in 1980. Using fault parameters from previous geodetic studies to define a set of larger faults, our models calculate the deformation field in the surrounding rock volume. We compare predicted strain and stress fields with the surface deformation measured in the area following the 1980 earthquake. Using a combination of the redistributed elastic dislocation stress due to slip on the major faults and a small component of overburden stress, the models successfully predict normal faults and tensile fractures in the hanging wall of the reverse fault system. Orientations of the predicted faults vary along strike of the fault system, being parallel to the main reverse fault in the south but oblique to it along the central segment, agreeing with observed surface breaks. The results of our forward modeling are not sensitive to the magnitude or direction of a regional tectonic stress. The predicted fractures are controlled by the near-field, short-term redistributed stresses due to coseismic slip. The agreement between modeled and measured deformation patterns adds confidence in the use of elastic dislocation theory to accurately predict small faults generated by coseismic slip on large faults.

show abstract

Section: Results From Forward Elastic Dislocation Modeling Of the 198supporting

confidence: 91%

Fracture prediction for the 1980 El Asnam, Algeria earthquake via elastic dislocation modeling

Healy

Yielding²,

Kusznir

2004

Tectonics

View full text Add to dashboard Cite

show abstract

“…In general, the horizontal component data are better fit by the synthetics than are the vertical component data. Brustle & Muller (1983) also noted better fits for Love wave seismograms than Rayleigh wave seismograms, suggesting that Rayleigh waves are apparently more influenced by the details of crustal structure and lateral velocity variations.…”

Section: Moment Tensor Inversionmentioning

confidence: 92%

The 1984 Round Valley, California Earthquake Sequence

Smith¹,

Cockerham²

1988

Geophysical Journal International

View full text Add to dashboard Cite

The 1984 November 23 ML 5.8 Round Valley earthquake is one in the.series of moderate earthquakes to have occurred in the Bishop-Mammoth Lakes, California area since 1978. This event and its aftershock sequence are particularly well recorded in that they occurred within a dense, local high frequency seismic network, and strong motion accelerograms, and regional and teleseismic digital seismograms are available for the main shock. We have derived the fault plane solution from the local and regional first motion data, inverted the teleseismic body wave data for the moment tensor solution, and fit regional surface waves for the low frequency moment. Unlike results for several of the earlier moderate events in the Bishop-Mammoth Lakes region, all results for the Round Valley main shock data sets give solutions consistent with left-lateral strike slip faulting on a near vertical N30"E striking plane. The seismic moment of the main shock from the regional surface wave analysis is 7.9 X 101'Nt m. Measurements of the seismic moment from regional surface waves and teleseismic body waves have been converted to spectral level and combined with the acceleration spectra to give a composite source spectrum for the main shock. The spectrum shows a lower corner frequency at 0.2Hz associated with the overall faulting event, and a higher comer frequency at 4.0 Hz which may be associated with the subevents composing the but at a lower slope of w -l between the low and high frequency corners as postulated in models for complex or partial stress drop events.The Round Valley main shock was followed by a widespread and prolonged aftershock sequence. Because of the dense local, high gain permanent seismograph network operated jointly by the University of Nevada-Reno and the United States Geological Survey, accurate locations and fault plane solutions could be determined for the aftershocks beginning immediately after the main shock, and the temporal and spatial growth of the aftershock sequence could be followed in detail. The Round Valley sequence is characterized by the development of two conjugate planes of aftershock activity; one, a near vertical plane striking N30"E associated with the main shock, and another which developed in the first 24 h of activity striking N40"W and dipping 55"NE. This shallow plane conforms to an extension of the Hilton Creek fault postulated by Malcome Clark, and may be the first indication of activity on this major Holocene structure since the recent period of earthquake activity began in 1978. Aftershocks defining the deeper near vertical plane tend to concentrate around the periphery of a 36-49 km2 area which appears to represent the slip surface of the main shock. Relating the seismic moment determined from regional surface waves to this slip area results in an average dislocation of 0.54-0.73 m and a stress drop of 1.5-2.3 MPa. Nearly 800 fault plane solutions for aftershocks were determined. A smaller subset which samples the aftershock zone both spatially and temporally shows that during the initial...

show abstract

“…Twelve of the 66 instrumental couples have a γ > 40°( our aforementioned arbitrary limit), which is a high value for modern DCs of the same event. Additionally, the largest γ Figure 8b but from the minimum variance Model 1-CFTI of Table 5. values (refer to the white columns in Figure 5 and to Figure 6) belong to the couples including DCs calculated from surface waves [Deschamps and King, 1983;Brüstle and Müller, 1983] and the somewhat anomalous solution by Sipkin [1987], who used body waves.…”

Section: The 1980 Rotation Statisticsmentioning

confidence: 99%

Intensity‐based source inversion of the destructive earthquake of 1694 in the southern Apennines, Italy

2013

View full text Add to dashboard Cite

[1] We inverted the regional pattern of intensities of the catastrophic earthquake of 1694 in the southern Apennines and determined the geometrical and kinematic characteristics of its source, including the double-couple orientation (strike angle 299°± 10°, dip 54°± 12°, and rake 309°± 11°; pure dip-slip solution not precluded). The objective nonlinear inversion was performed using the simple 11 parameter kinematic-function model (KF) with a niching genetic algorithm technique. The similarity between the pattern of the field intensities of the 1694 earthquake and the synthetic pattern is striking. This result is supported by the fact that our inversion technique was verified in the study area, where it was able to again find the source of the M s 6.9 Irpinia 1980 earthquake, known from instruments and from field surveys of the rupture. This type of inversion enables researchers to exploit the extensive intensity data from Italy and other countries to extend the knowledge of seismotectonic activity to preinstrumental times. New paleoseismological evidence and even published descriptions of the fault rupture by witnesses of the 1694 earthquake were found, confirming our results. We also present and apply a new algorithm, of general interest, to calculate disorientations between double-couples via standard linear algebra. The 3-D rotations that bring the pairwise orthogonal unit vectors that were estimated by our intensity inversion into the instrumental triples of the 1980 Irpinia earthquake, assumed as benchmarks, provide verification of our algorithm.

show abstract

Moment and duration of shallow earthquakes from Love-wave modelling for regional distances

Cited by 42 publications

References 10 publications

Fracture prediction for the 1980 El Asnam, Algeria earthquake via elastic dislocation modeling

Fracture prediction for the 1980 El Asnam, Algeria earthquake via elastic dislocation modeling

The 1984 Round Valley, California Earthquake Sequence

Intensity‐based source inversion of the destructive earthquake of 1694 in the southern Apennines, Italy

Contact Info

Product

Resources

About