Chinese National Network Magnitudes, Their Relation to NEIC Magnitudes, and Recommendations for New IASPEI Magnitude Standards

Bormann, Peter; Liu, Ruifeng; Ren, Xiao; Gutdeutsch, Rudolf; Kaiser, Diethelm; Castellaro, Silvia

doi:10.1785/0120060078

Cited by 72 publications

(25 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From a comparison between M JMA and M s , Tsuboi [] and Bormann et al . [] found negligible differences between these two scales with a magnitude ranging from 4 to 8. Therefore, in this work, both types of magnitudes are simply denoted as M .…”

Section: Datasupporting

confidence: 90%

New τ_c regression relationship derived from all P wave time windows for rapid magnitude estimation

Peng

Yang

Zheng

et al. 2017

Geophysical Research Letters

View full text Add to dashboard Cite

Two issues related to the average period τc early‐warning parameter are the magnitude saturation effect on large earthquakes and considerable scatter for small earthquakes. To reduce the effect of these two issues on earthquake early‐warning systems, we introduce a new τc regression relationship derived from all P wave time windows (PTWs) in high‐pass filtered (T = 0.075 Hz) strong‐motion data for three damaging moderate‐to‐large earthquakes. Our results show that this relationship provides a better and more stable magnitude prediction than those derived from 3 s PTW without a saturation effect on large earthquakes with M < 7.5. It is expected that fewer false alerts (those outside the magnitude uncertainty tolerance) would be issued. Additionally, a reduction of the initial PTWs to 1–2 s and evolutionary calculation with an expanding window allow more lead time for small‐to‐moderate events.

show abstract

Section: Datasupporting

confidence: 90%

New τ_c regression relationship derived from all P wave time windows for rapid magnitude estimation

Peng

Yang

Zheng

et al. 2017

Geophysical Research Letters

View full text Add to dashboard Cite

show abstract

“…The correction for the propagation path effects is accomplished by applying spectral amplitude decay functions for different periods, that have been computed using numerical simulations of Green's functions based on the reference Earth model AK135Q. Our procedure avoids the problem of the time window saturation effect in magnitude determination [ Bormann et al , 2007] and can be implemented in rapid response systems since it allows to properly determine Me within minutes of the first P‐wave arrival, even for great earthquakes with very long rupture duration, such as the 26 December 2004 Sumatra earthquake. We applied our procedure to 61 recent earthquakes and showed that our Me determinations agree on average reasonably well with the more formal and accurate but slower Me determined by the USGS.…”

Section: Discussionmentioning

confidence: 99%

Rapid determination of Me for strong to great shallow earthquakes

Giacomo

Grosser

Parolai

et al. 2008

Geophysical Research Letters

View full text Add to dashboard Cite

[1] We propose a new rapid procedure for determining the energy magnitude Me for shallow events from broadband teleseismic P-wave signals within the distance range 20°-98°. To accomplish this task, we compute spectral amplitude decay functions for different periods using numerical simulations based on the reference Earth model AK135Q. By means of these functions, we correct the spectra of the teleseismic recordings for the propagation path effects, and calculate the radiated seismic energy E S , and hence Me. We use cumulative P-wave windows for simulating a real-or near real-time procedure and test it for 61 shallow earthquakes. The results show that our approach is able to provide a rapid and reliable Me determination within 7 -15 minutes after the earthquake origin time, and is therefore suitable for implementation in rapid response systems. Citation: Di Giacomo, D., H. Grosser, S. Parolai, P.Bormann, and R. Wang (2008), Rapid determination of Me for strong to great shallow earthquakes, Geophys. Res. Lett., 35, L10308,

show abstract

“…The homogenization of magnitude of earthquake catalogues is very important to shift all earthquakes in one common magnitude scale to interpret earthquake size characterization and associated phenomenon. In order to homogenize the magnitude, we correlated different magnitude reported for same earthquake recorded in these three catalogues and derived some regionspecific empirical relationship between different magnitude scales (Bormann et al 2007). In this work, the moment magnitude (M w ) scale is selected as the representative homogeneous scale for each recorded seismic event.…”

Section: Data Source and Methodologymentioning

confidence: 99%

Seismicity distribution and focal mechanism solution of major earthquakes of northern Pakistan

et al. 2015

View full text Add to dashboard Cite

Pakistan is situated very close to the subduction zone of Indian-Arabian plates and Indian-Eurasian plates. Thus, it is a country with moderate to high seismicity with a large number of major earthquakes. Therefore, the severity of seismic hazards of major earthquakes is not ignorable. The seismicity of northern areas of Pakistan (33-37°N and 70-76°E), which are the part of North West Himalaya, is studied. Three earthquake catalogues are selected and then completed for this purpose. The spatial distribution of their epicenters, as a function of depth, shows that most of the earthquakes (about 84 %) occurred in shallow to intermediate depths. Relationship between major faults and their source mechanism is also investigated. The Focal mechanism solutions of 39 significant earthquakes in this area, occurred in the period of 1976-2014 with magnitude M w [ 5.0, are also analyzed. The focal depth of these events is in the range of 10-244 km. Among 39 focal mechanisms, the majority of them located in lower crust. Global centroid moment tensor solutions indicate that the majority of the seismic events show strike-slip faulting with a left-lateral sense of motion, followed by thrust and normal faulting. Most of these focal mechanisms located in the HinduKush, a most seismically active, region. The major source of these events and thrusting is the subduction of the Indian plate under the Eurasian Plate. At shallow to intermediate depth, low-to-intermediate angle thrust faulting is dominant. It is seen that in a large number of seismic events the compressive stress is acting nearly in NNW-SSE to N-S directions.

show abstract

Chinese National Network Magnitudes, Their Relation to NEIC Magnitudes, and Recommendations for New IASPEI Magnitude Standards

Cited by 72 publications

References 18 publications

New τ_c regression relationship derived from all P wave time windows for rapid magnitude estimation

New τ_c regression relationship derived from all P wave time windows for rapid magnitude estimation

Rapid determination of Me for strong to great shallow earthquakes

Seismicity distribution and focal mechanism solution of major earthquakes of northern Pakistan

Contact Info

Product

Resources

About

Chinese National Network Magnitudes, Their Relation to NEIC Magnitudes, and Recommendations for New IASPEI Magnitude Standards

Cited by 72 publications

References 18 publications

New τc regression relationship derived from all P wave time windows for rapid magnitude estimation

New τc regression relationship derived from all P wave time windows for rapid magnitude estimation

Rapid determination of Me for strong to great shallow earthquakes

Seismicity distribution and focal mechanism solution of major earthquakes of northern Pakistan

Contact Info

Product

Resources

About

New τ_c regression relationship derived from all P wave time windows for rapid magnitude estimation

New τ_c regression relationship derived from all P wave time windows for rapid magnitude estimation