Nonstationary spatial correlation in New Zealand strong ground‐motion data

2021 ◽  
Author(s):  
Yilin Chen ◽  
Brendon A. Bradley ◽  
Jack W. Baker
Keyword(s):  
New Zealand ◽  
Spatial Correlation ◽  
Ground Motion ◽  
Strong Ground Motion ◽  
Motion Data ◽  
Strong Ground

Characteristics of strong ground motion data recorded in the Gubbio sedimentary basin (Central Italy)

2006 ◽  
Vol 5 (1) ◽  
pp. 27-43 ◽  
Author(s):  
F. Pacor ◽  
D. Bindi ◽  
L. Luzi ◽  
S. Parolai ◽  
S. Marzorati ◽  
...  
Keyword(s):  
Ground Motion ◽  
Strong Ground Motion ◽  
Sedimentary Basin ◽  
Central Italy ◽  
Motion Data ◽  
Strong Ground

Verification of attenuation models based on strong ground motion data in Northern Thailand

2020 ◽  
Vol 133 ◽  
pp. 106145
Author(s):  
Weeradetch Tanapalungkorn ◽  
Lindung Zalbuin Mase ◽  
Panon Latcharote ◽  
Suched Likitlersuang
Keyword(s):  
Ground Motion ◽  
Strong Ground Motion ◽  
Northern Thailand ◽  
Motion Data ◽  
Attenuation Models ◽  
Strong Ground

A fault model with variable slip duration for the 1989 Loma Prieta, California, earthquake determined from strong-ground-motion data

1996 ◽  
Vol 86 (1A) ◽  
pp. 122-132
Author(s):  
Stephen Horton
Keyword(s):  
Ground Motion ◽  
Strong Ground Motion ◽  
Propagation Rate ◽  
Fault Model ◽  
Fault Surface ◽  
Loma Prieta Earthquake ◽  
Motion Data ◽  
Finite Fault ◽  
Loma Prieta ◽  
Strong Ground

Abstract A finite-fault model with variable slip duration is inferred from strong-ground-motion data for the Loma Prieta earthquake. Unlike previous models, slip duration is found to be consistent with fault width scaling. Slip duration varies between 1 and 6 sec at points along the fault surface with values between 3 and 6 sec, where slip amplitudes obtain or exceed the average slip of 98 cm. Modest high-frequency modifications of the slip function shape greatly enhance the data fit without significantly changing the inferred static offset or rupture characteristics. This model exhibits bilateral rupture with the propagation rate of the main energy release of 3 km/sec or less. The moment is 2.3 × 1026 dyne-cm, and the largest slip amplitudes occur northwest of the hypocenter. The rake varies with position along the fault from dominantly strike slip in the southeast to dominantly reverse slip in the northwest.

Estimation of attenuation relations for strong-motion data allowing for individual earthquake magnitude uncertainties

1997 ◽  
Vol 87 (6) ◽  
pp. 1674-1678
Author(s):  
David A. Rhoades
Keyword(s):  
Ground Motion ◽  
Regression Models ◽  
Strong Ground Motion ◽  
Strong Motion ◽  
Error Variance ◽  
Attenuation Relations ◽  
Motion Data ◽  
Different Levels ◽  
Magnitude Determination ◽  
Strong Ground

Abstract Standard errors of earthquake magnitudes are routinely calculated and vary appreciably between earthquakes. However, the uncertainties of magnitude determination are usually ignored in regression models of strong ground motion as a function of magnitude and distance from the earthquake source. This practice has the potential to bias estimates of strong ground motion. A method is given for taking account of the uncertainty of each magnitude determination in fitting such models. It extends previous methods in which the error variance is partitioned into between-earthquake and within-earthquake components. It allows for further decomposition of the between-earthquake component into a part attributable to magnitude uncertainties and a part attributable to other causes. The method has been applied to the well-known attenuation data of Joyner and Boore (1981). The Mw determinations in this dataset fall into two subsets with distinctly different levels of precision, namely, those determined directly and those inferred from values of ML. It is shown that most of the between-earthquake component of variance can be attributed to the relatively low precision of the magnitudes in the latter subset.

The importance of surface waves in strong ground-motion

1977 ◽  
Vol 10 (4) ◽  
pp. 170-173
Author(s):  
W. D. Smith
Keyword(s):  
New Zealand ◽  
Surface Waves ◽  
Ground Motion ◽  
Rayleigh Waves ◽  
Regional Variation ◽  
Strong Ground Motion ◽  
Focal Depth ◽  
Qualitative Explanation ◽  
S Wave ◽  
Strong Ground

Surface waves, when present in strong ground-motion, may contribute more to the Modified Mercalli intensity and to damage than does the S wave, even if the S wave contains higher accelerations. This gives a qualitative explanation for the observed regional variation in the felt effects of earthquakes in New Zealand, by assuming a regional variation in the predominant focal depth and hence in the amplitudes of the Love and Rayleigh waves that are excited.

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