scholarly journals Daily Variation in Earthquake Detection Capability: A Quantitative Evaluation

10.5772/54890 ◽  
2013 ◽  
Author(s):  
Takaki Iwata
Keyword(s):  
Quantitative Evaluation ◽  
Daily Variation ◽  
Detection Capability ◽  
Earthquake Detection

Earthquake detection capability of North Indian seismological stations

1976 ◽  
Vol 114 (3) ◽  
pp. 461-467
Author(s):  
B. S. R. Rao ◽  
T. K. S. Prakasa Rao ◽  
A. S. Krishnamurthy
Keyword(s):  
Detection Capability ◽  
Earthquake Detection

Effect of Combining Catalogs with Different Completeness

2020 ◽  
Author(s):  
Myunghyun Noh
Keyword(s):  
Korean Peninsula ◽  
North Korea ◽  
Seismic Network ◽  
The Other ◽  
Earthquake Catalog ◽  
Detection Capability ◽  
Chi Square ◽  
Earthquake Detection ◽  
Seismic Networks ◽  
Target Monitoring

<p>In most seismic studies, we prefer the earthquake catalog that covers a larger region and/or a longer period. We usually combine two or more catalogs to achieve this goal. When combining catalogs, however, care must be taken because their completeness is not identical so that unexpected flaws may be caused.</p><p>We tested the effect of combining inhomogeneous catalogs using the catalog of Korea Meteorological Administration (KMA). In fact, KMA provides a single catalog containing the earthquakes occurred in and around the whole Korean Peninsula. Like the other seismic networks, however, the configuration of the KMA seismic network is not uniform over its target monitoring region, so is the earthquake detection capability. The network is denser in the land than in the off-shore. Moreover, there are no seismic information available from North Korea. Based on these, we divided the KMA catalog into three sub-catalogs; SL, NL, and AO catalogs. The SL catalog contains the earthquakes occurred in the land of South Korea while the NL catalog contains those in the land of North Korea. The AO catalog contains all earthquakes occurred in the off-shore surrounding the peninsula.</p><p>The completeness of a catalog is expressed in terms of m<sub>c</sub>, the minimum magnitude above which no earthquakes are missing. We used the Chi-square algorithm by Noh (2017) to estimate the m<sub>c</sub>. It turned out, as expected, that the m<sub>c</sub> of the SL is the smallest among the three. Those of NL and AO are comparable. The m<sub>c</sub> of the catalog combining the SL and AO is larger than those of individual catalogs before combining. The m<sub>c</sub> is largest when combining all the three. If one needs more complete catalog, he or she had better divide the catalog into smaller ones based on the spatiotemporal detectability of the seismic network. Or, one may combine several catalogs to cover a larger region or a longer period at the expense of catalog completeness.</p>

scholarly journals Earthquake detection capability of the Swiss Seismic Network

2010 ◽  
pp. no-no ◽  
Author(s):  
K. Z. Nanjo ◽  
D. Schorlemmer ◽  
J. Woessner ◽  
S. Wiemer ◽  
D. Giardini
Keyword(s):  
Seismic Network ◽  
Detection Capability ◽  
Earthquake Detection

scholarly journals Earthquake Detection Capability of Matsushiro Seismological Observatory

1972 ◽  
Vol 23 (3) ◽  
pp. 197-213
Author(s):  
Noboru Yamagishi ◽  
Susumu Saito ◽  
Shigeji Suyehiro
Keyword(s):  
Detection Capability ◽  
Earthquake Detection ◽  
Seismological Observatory

scholarly journals The Signal to Noise Ratio and the Completeness Magnitude: The Effect of the COVID-19 Lockdown

Atmosphere ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 525
Author(s):  
Cataldo Godano ◽  
Vincenzo Convertito ◽  
Nicola Alessandro Pino
Keyword(s):  
Urban Areas ◽  
Signal To Noise Ratio ◽  
Point Of View ◽  
Slight Reduction ◽  
Detection Capability ◽  
Signal To Noise ◽  
Statistical Point ◽  
Earthquake Detection ◽  
Completeness Magnitude ◽  
Noise Ratio

We analyse the earthquakes catalogues for Italy, South California, and Greece across the COVID-19 lockdown period for each country. The results for Italy and Greece show that, even if the reduction of the signal to noise ratio has improved the earthquake detection capability, the completeness magnitude remains substantially unchanged, making the improved detection capability ineffective from the statistical point of view. A slight reduction (0.2) of the completeness magnitude is observed for South California, likely related to the relatively higher number of seismic stations located close to urban areas. Our findings suggest that—given the present configuration of the seismic network considered here—only an important decrease in the station spacing can produce a significant decrease of the completeness magnitude.

Sign in / Sign up

Export Citation Format

Share Document