An experiment in systematic study of global seismicity: Centroid‐moment tensor solutions for 201 moderate and large earthquakes of 1981

Dziewoński, Adam M.; Woodhouse, John

doi:10.1029/jb088ib04p03247

Cited by 667 publications

(280 citation statements)

References 23 publications

Supporting

Mentioning

268

Contrasting

Unclassified

Order By: Relevance

“…For the remaining decade (1990 -1999) this catalog has been integrated with M s ! 7.0 seismic events reported by the Harvard centroid moment tensor (CMT) catalog [Dziewonski et al, 1981;Dziewonski and Woodhouse, 1983]. The total number of events of this data set (hereinafter referred to as PSCMT-M7) is 792 (see Figure 1).…”

Section: Data Setmentioning

confidence: 99%

Remote seismic influence on large explosive eruptions

Marzocchi

2002

J. Geophys. Res.

View full text Add to dashboard Cite

[1] The physical process governing the occurrence of the greatest explosive eruptions is characterized by a very high number of degrees of freedom. In this case, as well as for any stochastic and/or complex system, the knowledge of the process can be significantly improved by identifying any kind of nonrandom pattern. For example, a correlation with other processes would imply that some degrees of freedom are more important than the others. In this view, the main goal of this paper is to test if the perturbation induced on a volcanic area by great tectonic earthquakes can modify the probability of a volcanic event. The results obtained show that the occurrence of the largest explosive eruptions of the last century is significantly correlated to the earthquakes that occurred 0-5 and 30 -35 years before, at distances up to 1000 km. Such a coupling might be attributed to the coseismic and postseismic stress diffusion. This result provides new insights that may be used in volcanic risk mitigation. INDEX TERMS: 8414 Volcanology: Eruption mechanisms, 7320 Seismology: Seismicity and seismotectonics;

show abstract

Section: Data Setmentioning

confidence: 99%

Remote seismic influence on large explosive eruptions

Marzocchi

2002

J. Geophys. Res.

View full text Add to dashboard Cite

show abstract

“…Distribution of focal mechanisms in the global catalog of earthquakes in this study (all recorded events between 1997 and mid-2010 with M 0 ≥ 10 19 ). Focal mechanisms from the gCMT catalog [Dziewonski et al, 1981;Dziewonski and Woodhouse, 1983;Ekström et al, 2005] are plotted with shallower events overlapping deeper ones and colored by their corresponding energy-to-moment ratio. Histogram shows the distribution of values plotted in map.…”

Section: Focal Mechanismmentioning

confidence: 99%

Global evaluation of large earthquake energy from 1997 through mid-2010

Convers

Newman

2011

J. Geophys. Res.

View full text Add to dashboard Cite

[1] We develop an updated radiated seismic energy E catalog of global earthquakes with seismic moment M 0 ≥ 10 19 Nm (M W ≥ 6.7) from 1997 through mid-2010, recording 342 events using 17849 seismograms. Station-specific corrections and event duration-dependent total P wave group calculations allow for improved E determinations for large-and long-duration earthquakes. We find the global mean energy-to-moment ratio = log 10 (E/M 0 ) = −4.59 ± 0.36. Robust deviations are found for thrust ( T = −4.74), strike-slip ( SS = −4.44), and normal ( N = −4.51) faulting events. For two regions with recent energy deficient tsunami earthquakes (TsE), we examine all large thrust earthquakes with M 0 ≥ 5 × 10 17 Nm (M W ≥ 5.7), to identify a regional characterization in their relative radiated energy-to-moment ratio. While thrust events along Java, Indonesia, the site of two TsE events in 1994 and 2006, are comparable ( T−JV = −4.91) to the global thrust average, events along the Middle America Trench (MAT), the site of the 1992 Nicaragua TsE, are consistently deficient ( T−MAT = −5.15). Along the MAT, a trend of increased deficiency in radiated energy to the southeast occurs in the direction of more rapid plate convergence. Global thrust mechanisms become increasingly deficient in radiated seismic energy at shallow depths, with TsE events representing the shallowest and most energetically deficient end-member of the events in the study. Results suggest thrust events are highly variable but tend to increase in apparent stress from about 15 kPa near the surface to 2 MPa near 70 km depth.

show abstract

“…Currently, the NEIC runs two moment-tensor inversions as part of its real-time operations: a body-wave moment tensor algorithm based on Sipkin (1982), which uses long-period (< 80s) teleseismic data (P, SH, and SV phases) and is accurate over the approximate magnitude range 5.5 ≤ M w ≤ 7.0 (depending on the complexity of the source); and a centroid moment tensor algorithm based on Dziewoński and Woodhouse (1983), which uses 100-400 s data (dominated by Love and Rayleigh waves) and is accurate over the approximate magnitude range 6.0 ≤ M w ≤ 8.5. For near-source stations (within 10°), and for very large earthquakes (M > 9), most moment tensor inversion methods suffer from clipped records; the W-phase inversion may be the only approach that can satisfactorily deal with such situations.…”

Section: Discussionmentioning

confidence: 99%