Kevin Mayeda
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View article: Using a 1D Radially Symmetric Coda Envelope Model for Robust Moment Magnitude (Mw) Estimation in Iraq’s Tectonically Diverse Zones
Using a 1D Radially Symmetric Coda Envelope Model for Robust Moment Magnitude (Mw) Estimation in Iraq’s Tectonically Diverse Zones Open
Robust estimation of moment magnitude (Mw) can be challenging for Iraq due to the strong lateral heterogeneity across diverse tectonic zones. We aim to improve moment magnitude estimation by investigating the reliability of using a 1D coda…
View article: A UK <i>M</i>w catalogue derived from coda envelopes
A UK <i>M</i>w catalogue derived from coda envelopes Open
SUMMARY The United Kingdom (UK) experiences low-to-moderate levels of seismicity; only 12 onshore earthquakes with local magnitude (ML) ≥ 4.0 have been recorded in the past 20 yr. It is therefore difficult to estimate moment magnitude (Mw)…
View article: Model Building for Amplitude Prediction
Model Building for Amplitude Prediction Open
View article: Regional CODA magnitudes in central Asia and MB (LG) transportability.
Regional CODA magnitudes in central Asia and MB (LG) transportability. Open
Local and near regional coda have been shown to provide accurate and precise estimates of source, path and site effects. Using empirical methods, we investigate tlic use of coda to determine moments and magnitudes using regional distance (…
View article: SF Bay Area Coda Calibration Example Dataset for CCT
SF Bay Area Coda Calibration Example Dataset for CCT Open
The following is an example dataset specific for the Coda Calibration Tool (CCT) that is focused on the San Francisco Bay Area region using a small-to-moderate magnitude earthquake dataset spanning local-to-regional distances using open da…
View article: SF Bay Area Coda Calibration Example Dataset for CCT
SF Bay Area Coda Calibration Example Dataset for CCT Open
The following is an example dataset specific for the Coda Calibration Tool (CCT) that is focused on the San Francisco Bay Area region using a small-to-moderate magnitude earthquake dataset spanning local-to-regional distances using open da…
View article: Different Tectonics, Same Approach: Estimation of source parameters using the Coda Calibration Tool (CCT).
Different Tectonics, Same Approach: Estimation of source parameters using the Coda Calibration Tool (CCT). Open
It is well known that the use of different methods (e.g., spectral fitting, empirical Green’s functions) for compiling catalogs of source parameters (e.g., seismic moment, stress drop) can results in significant inconsistencies (Balt…
View article: SF Bay Area Coda Calibration Example Dataset for CCT
SF Bay Area Coda Calibration Example Dataset for CCT Open
The following is an example dataset specific for the Coda Calibration Tool (CCT) that is focused on the San Francisco Bay Area region using a small-to-moderate magnitude earthquake dataset spanning local-to-regional distances using open da…
View article: Source scaling comparison and validation in Central Italy: data intensive direct <i>S</i>waves versus the sparse data coda envelope methodology
Source scaling comparison and validation in Central Italy: data intensive direct <i>S</i>waves versus the sparse data coda envelope methodology Open
SUMMARY Robustness of source parameter estimates is a fundamental issue in understanding the relationships between small and large events; however, it is difficult to assess how much of the variability of the source parameters can be attri…
View article: On the non uniqueness of the source, propagation and site effects decomposition
On the non uniqueness of the source, propagation and site effects decomposition Open
Earth and Space Science Open Archive This preprint has been submitted to and is under consideration at Journal of Geophysical Research - Solid Earth. ESSOAr is a venue for early communication or feedback before peer review. Data may be pre…
View article: A Big Problem for Small Earthquakes: Benchmarking Routine Magnitudes and Conversion Relationships with Coda Envelope-Derived Mw in Southern Kansas and Northern Oklahoma
A Big Problem for Small Earthquakes: Benchmarking Routine Magnitudes and Conversion Relationships with Coda Envelope-Derived Mw in Southern Kansas and Northern Oklahoma Open
Earthquake magnitudes are widely relied upon measures of earthquake size. Although moment magnitude (Mw) has become the established standard for moderate and large earthquakes, difficulty in reliably measuring seismic moments for small (ge…
View article: Regional Analysis of Lg Attenuation: Comparison of 1D Methods in Northern California and Application to the Yellow Sea / Korean Peninsula
Regional Analysis of Lg Attenuation: Comparison of 1D Methods in Northern California and Application to the Yellow Sea / Korean Peninsula Open
The measurement of regional attenuation Q{sup -1} can produce method dependent results. The discrepancies among methods are due to differing parameterizations (e.g., geometrical spreading rates), employed datasets (e.g., choice of path len…
View article: LLNL Calibration Program: Data Collection, Ground Truth Validation, and Regional Coda Magnitude
LLNL Calibration Program: Data Collection, Ground Truth Validation, and Regional Coda Magnitude Open
Lawrence Livermore National Laboratory (LLNL) integrates and collects data for use in calibration of seismic detection, location, and identification. Calibration data is collected by (1) numerous seismic field efforts, many conducted under…
View article: Moment Magnitude Calibration for the Eastern Mediterranean Region from Broadband Regional Coda Envelopes
Moment Magnitude Calibration for the Eastern Mediterranean Region from Broadband Regional Coda Envelopes Open
The following is an overview of results from ROA01-32 that focuses on an empirical method of calibrating stable seismic source moment-rate spectra derived from regional coda envelopes using broadband stations. The main goal was to develop …
View article: Toward Robust and Routine Determination of Mw for Small Earthquakes: Application to the 2020 Mw 5.7 Magna, Utah, Seismic Sequence
Toward Robust and Routine Determination of Mw for Small Earthquakes: Application to the 2020 Mw 5.7 Magna, Utah, Seismic Sequence Open
To better characterize seismic hazard, particularly, for induced seismicity, there is an increasing interest in methods to estimate moment magnitude (Mw) for small earthquakes. Mw is generally preferred over other magnitude types, but, it …
View article: Analysis of Source Parameters relationships for clusters of similar events recorded in Central Apennines
Analysis of Source Parameters relationships for clusters of similar events recorded in Central Apennines Open
<p><span><span>Aim of this study is to investigate the relationship between moment magnitude (Mw) and source duration (i.e. corner frequency) for moderate to small magnitude earthquakes recorded in Central Apennines, Ital…
View article: The Coda Calibration and Processing Tool: Java-Based Freeware for the Geophysical Community
The Coda Calibration and Processing Tool: Java-Based Freeware for the Geophysical Community Open
<p>The coda magnitude method of <em>Mayeda and Walter</em> (1996) provides stable source spectra and moment magnitudes (<em>M</em><em><sub>w</sub></em>) for local to regional events fro…
View article: Evaluation of earthquake stress parameters and its scaling during the 2016-2017 Amatrice-Norcia-Visso sequence—Part I
Evaluation of earthquake stress parameters and its scaling during the 2016-2017 Amatrice-Norcia-Visso sequence—Part I Open
The Amatrice–Norcia–Visso sequence is distinguished by complex behaviour that is somewhat atypical of main-shock–aftershock sequences, as there were multiple large main shocks that continued for months. Here, we focus on the Amatrice seque…
View article: Earthquake stress via event ratio levels: Application to the 2011 and 2016 Oklahoma seismic sequences
Earthquake stress via event ratio levels: Application to the 2011 and 2016 Oklahoma seismic sequences Open
We develop a new methodology for determining earthquake stress drop and apparent stress values via spectral ratio asymptotic levels. With sufficient bandwidth, the stress ratio for a pair of events can be directly related to these low‐ and…
View article: Regional Coda 2-D P and S-wave Calibration, Support, and Coda Tool Development
Regional Coda 2-D P and S-wave Calibration, Support, and Coda Tool Development Open
The following describes work completed between April 2014 through February 2016. As in past years, Dr. Mayeda is a point of contact for LLNL’s colleagues in Florida and provides calibration, troubleshooting support, integration of new coda…
View article: 2D Coda and Direct-Wave Attenuation Tomography in Northern Italy
2D Coda and Direct-Wave Attenuation Tomography in Northern Italy Open
A 1D coda method was proposed by Mayeda et al. (2003) in order to obtain stable seismic source moment-rate spectra using narrowband coda envelope measurements. That study took advantage of the averaging nature of coda waves to derive stabl…
View article: Moment Magnitudes of Local/Regional Events from 1D Coda Calibrations in the Broader Middle East Region
Moment Magnitudes of Local/Regional Events from 1D Coda Calibrations in the Broader Middle East Region Open
Reliable moment magnitude estimates for seismic events in the Middle East region can be difficult to obtain due to the uneven distribution of stations, the complex tectonic structure, and regions of high attenuation. In this paper, we take…