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Journal Article

A Software Package to Analyze Seismicity: ZMAP

Stefan Wiemer

Journal: Seismological Research Letters

Publisher: Seismological Society of America

Published: 01 May 2001

Seismological Research Letters (2001) 72 (3): 373–382.

DOI: https://doi.org/10.1785/gssrl.72.3.373

... (and many others). ZMAP , developed by Stefan Wiemer, allows the user to examine an earthquake catalog from many different angles. Not only does it include the traditional map, cross-section, and time sequence parameters, but also several others, such as event size and mechanism. These can be combined...

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A magnitude-completeness graph obtained using the <span class="search-highlight">ZMAP</span> program in the Cal...

A magnitude-completeness graph obtained using the ZMAP program in the Cal...

in A Nonparametric Analysis of the Spatial Distribution of Earthquake Magnitudes > Bulletin of the Seismological Society of America

Published: 01 August 2011

Figure 7. A magnitude-completeness graph obtained using the ZMAP program in the California example. The color version of this figure is available only in the electronic edition.

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Snapshots of some <span class="search-highlight">ZMAP</span> windows. The upper left frame shows the cumulative...

Snapshots of some ZMAP windows. The upper left frame shows the cumulative...

in A Software Package to Analyze Seismicity: ZMAP > Seismological Research Letters

Published: 01 May 2001

Figure 1. Snapshots of some ZMAP windows. The upper left frame shows the cumulative number of events (0 < M < 1.2; thick line) for the creeping section of the San Andreas Fault north of Parkfield. The thin line is the z value, which measures the significance of a seismicity rate change

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Cumulative distribution of burst magnitudes (136 unique events). The distri...

in Dynamic Driving of Small Shallow Events during Strong Motion > Bulletin of the Seismological Society of America

Published: 01 June 2009

Figure 10. Cumulative distribution of burst magnitudes (136 unique events). The distribution cannot be fit with standard Gutenberg–Richter models. We attempted to fit the curve with least-squares (MC LS [Zmap, see the Data and Resources section]), maximum likelihood (MC MLE [Zmap, see the Data

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(a) Cumulative and binned number of earthquakes versus magnitude. (b) Numbe...

in Report on the August 2012 Brawley Earthquake Swarm in Imperial Valley, Southern California > Seismological Research Letters

Published: 01 March 2013

Figure 6. (a) Cumulative and binned number of earthquakes versus magnitude. (b) Number of earthquakes per day versus time from mainshock. Zmap software was used to make these plots ( Wiemer, 2001 ).

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(a) Magnitude versus time plot for the background seismicity shown in Fig....

in The 1999 M w 7.1 Hector Mine, California, Earthquake Sequence: Complex Conjugate Strike-Slip Faulting > Bulletin of the Seismological Society of America

Published: 01 May 2002

Figure 5. (a) Magnitude versus time plot for the background seismicity shown in Fig. 4a . (b) Magnitude versus time plot showing the Hector Mine foreshocks and aftershocks. This figure was made using ZMAP ( Wiemer, 2000 ).

Journal Article

A Long‐Term Seismic Quiescence before the 2004 Sumatra ( M w 9.1) Earthquake

Kei Katsumata

Journal: Bulletin of the Seismological Society of America

Publisher: Seismological Society of America

Published: 06 January 2015

Bulletin of the Seismological Society of America (2015) 105 (1): 167–176.

DOI: https://doi.org/10.1785/0120140116

..., including 1153 earthquakes shallower than 100 km with body‐wave magnitude of 5.0≤ m b ≤6.7. A detailed analysis of the earthquake catalog using a gridding technique ( ZMAP ) shows the quiescent area is located between 3° and 6° N, which covers the southeastern part of the focal area, including the rupture...

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Journal Article

Seismic Quiescence before the 1999 Chi-Chi, Taiwan, M w 7.6 Earthquake

Yih-Min Wu, Ling-Yun Chiao

Journal: Bulletin of the Seismological Society of America

Publisher: Seismological Society of America

Published: 01 February 2006

Bulletin of the Seismological Society of America (2006) 96 (1): 321–327.

DOI: https://doi.org/10.1785/0120050069

... deviation with a mean value of 314 events per month. There was also a consistent trend of decreasing regional b -value as well as notable increases of seismic activity in areas surrounding the Chi-Chi earthquake source region via the Z-test map ( zmap ) analysis. 08 04 2005 Copyright © 2006...

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Magnitude–time distribution of M w ≥4 earthquakes that occurred in northe...

in Rate Changes, Premonitory Quiescence, and Synchronization of Earthquakes in Northern Italy and Its Surroundings > Seismological Research Letters

Published: 01 May 2014

and the corresponding uncertainty estimated by Woessner and Wiemer (2005) using ZMAP ( Wiemer, 2001 ).

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Magnitude-frequency plot for the first five days of aftershocks of the San ...

in Preliminary Report on the 22 December 2003, M 6.5 San Simeon, California Earthquake > Seismological Research Letters

Published: 01 March 2004

to the cumulative frequency plot, with M c the magnitude of completeness. The zmap tool was used to make this figure ( Wiemer and Wyss, 2002 ).

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Mapped b ‐values with the difference in percentage with respect to the...

in Pseudoprospective Evaluation of the Foreshock Traffic‐Light System in Ridgecrest and Implications for Aftershock Hazard Assessment > Seismological Research Letters

Published: 08 July 2020

Figure 6. Mapped b ‐values with the difference in percentage with respect to the background for two different periods: (a) between M w 6.4 and M w 7.1; (b) the first week after M w 7.1. The original maps were produced by ZMAP ( Wiemer, 2001 ; Reyes and Wiemer

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Curves of probability densities of earthquakes of different magnitudes in o...

in Seismicity around Late Quaternary Active Faults in China > Bulletin of the Seismological Society of America

Published: 02 July 2019

denote the probability densities of M ≥ 4.7 events deleted by using both the methods of Gardner and Knopoff (1974) and Reasenberg (1985) on the ZMAP platform ( Wiemer, 2001 ), respectively. PDF, probability density function.

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b -value map of Southern California as calculated by the entire magnitude r...

in Foreshock Rates from Aftershock Abundance > Bulletin of the Seismological Society of America

Published: 01 October 2008

Figure 1. b -value map of Southern California as calculated by the entire magnitude range method ( Woessner and Wiemer, 2005 ) with the software package zmap ( Wiemer, 2001 ), using 100 bootstraps on a 0.1°×0.1° grid with 100 earthquakes per grid node and 30 earthquakes above the completeness

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Magnitude–frequency distribution and completeness magnitude for earthquakes...

in Seismic Monitoring of an Underground Natural Gas Storage Facility: The Collalto Seismic Network > Seismological Research Letters

Published: 24 December 2014

Figure 6. Magnitude–frequency distribution and completeness magnitude for earthquakes located in (a) area A and (b) area B during the period 1 January 2012 to 31 December 2013. Calculations are made by software ZMAP using the EMR method ( Woessner and Wiemer, 2005 ). Magnitude is local

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Stress tensor inversion results for three focal mechanism subsets: west (W)...

in Microseismic Portrait of the Montello Thrust (Southeastern Alps, Italy) from a Dense High‐Quality Seismic Network > Seismological Research Letters

Published: 29 May 2019

of trend/plunge) of the maximum, intermediate, and minimum principal stress axis, respectively. R and Phi are the magnitude of the ratio of intermediate principal stress to the maximum and minimum stress, respectively, as originally defined by Gephart (1990) and implemented in ZMAP code ( Wiemer

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Cumulative number of earthquakes versus magnitude using different catalogs ...

in Stress Change and Fault Interaction from a Two Century‐Long Earthquake Sequence in the Central Tell Atlas, Algeria > Bulletin of the Seismological Society of America

Published: 26 September 2017

Figure 7. Cumulative number of earthquakes versus magnitude using different catalogs ( Benouar, 1994 ; Ayadi and Bezzeghoud, 2015 ) using Zmap software ( Wiemer, 2001 ) to obtain the magnitude of completeness = 3.6 ± 0.19 using the maximum‐likelihood estimate. Uncertainties

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Magnitude frequency distribution for earthquakes on the Shoreline fault. (a...

in Geometry and Earthquake Potential of the Shoreline Fault, Central California > Bulletin of the Seismological Society of America

Published: 01 February 2013

, and Gutenberg–Richter distribution parameters, a and b , found using the ZMAP software ( Wiemer, 2001 ) and the EMR method of Woessner and Wiemer (2005) . (b) Number of events per year, black line from the catalog and gray line from extrapolation using the Gutenberg–Richter parameters. The extrapolation

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(a) Southern California Seismic Network (SCSN)‐detected events (pick‐based ...

in The 2015 Fillmore Earthquake Swarm and Possible Crustal Deformation Mechanisms near the Bottom of the Eastern Ventura Basin, California > Seismological Research Letters

Published: 18 May 2016

are shown in red, whereas the template‐matching events are shown in blue bins. We used ZMAP ( Wiemer, 2001 ) to determine b ‐values that range from 0.86 to 1.01 (for magnitude of completeness, M c 0.8 and 1.4), which is similar to the average b ‐value for southern California ( Hutton et al. , 2010

Journal Article

Fractal Seismicity and Coulomb Stress Pattern Analysis for 7 January 2020 M w 6.4 Puerto Rico Earthquake

Tejaswini Mangalagiri, Haritha Chandriyan, Paresh Nath Singha Roy

Journal: Seismological Research Letters

Publisher: Seismological Society of America

Published: 07 September 2022

Seismological Research Letters (2023) 94 (1): 66–74.

DOI: https://doi.org/10.1785/0220220031

..., the effective completeness magnitude. The description and detailed explanation are mentioned in the ZMAP tutorial documentation ( Wiemer, 2001 ). The declustering, as expected, reduces the number of earthquakes in the catalog. From the declustered catalog, the magnitude of completeness ( M c...

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Journal Article

The Impact of USArray on Earthquake Monitoring in Alaska

Natalia A. Ruppert, Michael E. West

Journal: Seismological Research Letters

Publisher: Seismological Society of America

Published: 23 October 2019

Seismological Research Letters (2020) 91 (2A): 601–610.

DOI: https://doi.org/10.1785/0220190227

... and phase picks are from the Alaska Earthquake Center Catalog. Maps are made with Generic Mapping Tools (GMT) package (GMT version 4 [v.4], https://www.soest.hawaii.edu/gmt/ ). Frequency–magnitude and magnitude of completeness estimates are done with MATLAB‐based ZMAP software package (ZMAP v.7, Wiemer...

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