Aftershock Zone Scaling

  title={Aftershock Zone Scaling},
  author={Y. Kagan},
  journal={Bulletin of the Seismological Society of America},
  • Y. Kagan
  • Published 2002
  • Geology
  • Bulletin of the Seismological Society of America
We investigate the distribution of aftershock zones for large earthquakes (scalar seismic moment M ≥10 19.5 N m, moment magnitude, m ≥7). Mainshocks are selected from the Harvard centroid moment tensor catalog, and aftershocks are selected from the Preliminary Determination of Epicenters (NEIC) catalog. The aftershock epicenter maps are approximated by a two-dimensional Gaussian distribution; the major ellipse axis is taken as a quantitative measure of the mainshock focal zone size. The… Expand

Figures and Tables from this paper

Empirical Relationships between Aftershock Zone Dimensions and Moment Magnitudes for Plate Boundary Earthquakes in Taiwan
In this study, we establish the empirical relationships between the spatial dimensions of the aftershock zones and moment magnitudes ( M w) for the Taiwan region. The length ( l ) and width ( w ) ofExpand
On Mainshock Focal Mechanisms and the Spatial Distribution of Aftershocks
Despite previous observations that aftershocks lie preferentially along the fault planes of mainshocks, many branching models for earthquake occurrences do not directly incorporate information on theExpand
Maximal radius of the aftershock zone in earthquake networks
In this paper, several seismoactive regions were investigated (Japan, Southern California and two tectonically distinct Japanese subregions) and structural seismic constants were estimated for eachExpand
The paper considers the task of quick estimating an area where aftershocks are expected after a strong earthquake using information about its mainshock. The suggested approach is based on theExpand
Optimal Scaling of Aftershock Zones using Ground Motion Forecasts
The spatial distribution of aftershocks following major earthquakes has received significant attention due to the shaking hazard these events pose for structures and populations in the affectedExpand
Optimal Scaling of Aftershock Zones using Ground Motion Forecasts
The spatial distribution of aftershocks following major earthquakes has received significant attention due to the shaking hazard these events pose for structures and populations in the affectedExpand
Magnitude Limits of Subduction Zone Earthquakes
Maximum earthquake magnitude ( m x ) is a critical parameter in seismic hazard and risk analysis. However, some recent large earthquakes have shown that most of the existing methods for estimating mExpand
Quantifying early aftershock activity of the 2004 mid-Niigata Prefecture earthquake (Mw6.6)
[1] We analyze the early aftershock activity of the 2004 mid-Niigata earthquake, using both earthquake catalog data and continuous waveform recordings. The frequency-magnitude distribution analysisExpand
Complexity, aftershock sequences, and uncertainty in earthquake statistics
Earthquake statistics is a growing field of research with direct application to probabilistic seismic hazard evaluation. The earthquake process is a complex spatio-temporal phenomenon, and has beenExpand
Earthquake size distribution : Power-law with exponent β ≡ 1 2 ?
We propose that the widely observed and universal Gutenberg-Richter relation is a mathematical consequence of the critical branching nature of earthquake process in a brittle fracture environment.Expand


Interpretation of earthquake epicenter and CMT centroid locations, in terms of rupture length and direction
Abstract A comparison is made between hypocenter and centroid estimates of shallow earthquakes to investigate whether the difference between these two quantities contains useful information on faultExpand
Analysis of the relationship between seismic moment and fault length for large crustal strike‐slip earthquakes between 1977–92
We have used an uniform data set to determine the scaling relation between seismic moment M0 and fault length œ for 34 large, crustal, strike-slip earthquakes in the period 1977-92. The seismicExpand
Worldwide Doublets of Large Shallow Earthquakes
Abstract We investigated all the pairs of Mw >-- 7.5 shallow earthquakes in the Harvard catalog that occurred at a centroid distance of less than 100 km. We showed that most of these pairs haveExpand
Likelihood analysis of earthquake catalogues
SUMMARY We apply several classes of stochastic multidimensional models to statistical analysis of earthquake catalogues using likelihood methods. We investigate the importance of including differentExpand
Accuracy of modern global earthquake catalogs
We compare several modem (1977-present) worldwide earthquake catalogs to infer their completeness, earthquake origin time and hypocenter location accuracy, magnitude/scalar seismic moment errors, andExpand
Apparent Breaks in Scaling in the Earthquake Cumulative Frequency-Magnitude Distribution: Fact or Artifact?
It has been suggested that the finite width of the seismogenic lithosphere can have a strong effect on the frequency-moment relation for large earthquakes. Theories have been proposed in which largeExpand
Seismic moment distribution revisited: II. Moment conservation principle
SUMMARY We compare the tectonic rate with earthquake data using several theoretical distributions to approximate the seismic moment‐frequency relation. We derive formulae to estimate parameters ofExpand
Evidence for different scaling of earthquake source parameters for large earthquakes depending on faulting mechanism
Scaling relationships between seismic moment, rupture length, and rupture width have been examined. For this purpose, the data from several previous studies have been merged into a databaseExpand
Regional Difference in Scaling Laws for Large Earthquakes and its Tectonic Implication
Abstract—We compiled 67 large earthquakes which occurred at and around plate boundaries for the last 140 yrs, and classified them into four groups; interplate strike-slip events, intraplateExpand
Aftershock zones of large shallow earthquakes: fault dimensions, aftershock area expansion and scaling relations
SUMMARY We determine the aftershock areas from relocated hypocentres for 64 dip-slip and eight strike-slip earthquakes in the period 1977‐1996 together with those for three recent earthquakes, theExpand