Nonlinear Radiation Damping: A New Method for Dissipating Energy in Dynamic Earthquake Rupture Simulations
Dynamic earthquake rupture simulations are used to understand earthquake mechanics and the ground shaking that earthquakes produce. These simulations can help diagnose past earthquake behavior and are also used to generate scenarios of possible future earthquakes. Traditional dynamic rupture models...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Seismological Society of America
2023-04-01
|
| Series: | The Seismic Record |
| Online Access: | https://doi.org/10.1785/0320230001 |
| _version_ | 1797643281690001408 |
|---|---|
| author | Michael Barall Ruth A. Harris |
| author_facet | Michael Barall Ruth A. Harris |
| author_sort | Michael Barall |
| collection | DOAJ |
| description | Dynamic earthquake rupture simulations are used to understand earthquake mechanics and the ground shaking that earthquakes produce. These simulations can help diagnose past earthquake behavior and are also used to generate scenarios of possible future earthquakes. Traditional dynamic rupture models generally assume elastic rock response, but this can lead to peak on‐fault slip rates and ground shaking that are higher than those inferred from seismological observations. Some have approached this challenge using inelastic off‐fault rock behavior to dissipate energy, but the addition of inelasticity can make it difficult to select parameters and establish suitable initial conditions, and increases the model’s complexity and computational cost. We propose a new method that works by adding a nonlinear radiation damping term to the friction law, with the surrounding rocks remaining linear elastic. Our new method results in lower peak slip rates, reduced seismic radiation, and an increasing slip‐weakening critical distance with increasing rupture propagation distance, all within a linear elastic model. In addition, it is easy to implement. |
| first_indexed | 2024-03-11T14:12:28Z |
| format | Article |
| id | doaj.art-ae8c11ba7a064e51a3ff627808faa394 |
| institution | Directory Open Access Journal |
| issn | 2694-4006 |
| language | English |
| last_indexed | 2024-03-11T14:12:28Z |
| publishDate | 2023-04-01 |
| publisher | Seismological Society of America |
| record_format | Article |
| series | The Seismic Record |
| spelling | doaj.art-ae8c11ba7a064e51a3ff627808faa3942023-11-01T17:46:46ZengSeismological Society of AmericaThe Seismic Record2694-40062023-04-0132697610.1785/032023000123001Nonlinear Radiation Damping: A New Method for Dissipating Energy in Dynamic Earthquake Rupture SimulationsMichael Barall0https://orcid.org/0000-0001-7724-8563Ruth A. Harris1https://orcid.org/0000-0002-9247-0768Earthquake Science Center, U.S. Geological Survey, Moffett Field, California, U.S.A.Earthquake Science Center, U.S. Geological Survey, Moffett Field, California, U.S.A.Dynamic earthquake rupture simulations are used to understand earthquake mechanics and the ground shaking that earthquakes produce. These simulations can help diagnose past earthquake behavior and are also used to generate scenarios of possible future earthquakes. Traditional dynamic rupture models generally assume elastic rock response, but this can lead to peak on‐fault slip rates and ground shaking that are higher than those inferred from seismological observations. Some have approached this challenge using inelastic off‐fault rock behavior to dissipate energy, but the addition of inelasticity can make it difficult to select parameters and establish suitable initial conditions, and increases the model’s complexity and computational cost. We propose a new method that works by adding a nonlinear radiation damping term to the friction law, with the surrounding rocks remaining linear elastic. Our new method results in lower peak slip rates, reduced seismic radiation, and an increasing slip‐weakening critical distance with increasing rupture propagation distance, all within a linear elastic model. In addition, it is easy to implement.https://doi.org/10.1785/0320230001 |
| spellingShingle | Michael Barall Ruth A. Harris Nonlinear Radiation Damping: A New Method for Dissipating Energy in Dynamic Earthquake Rupture Simulations The Seismic Record |
| title | Nonlinear Radiation Damping: A New Method for Dissipating Energy in Dynamic Earthquake Rupture Simulations |
| title_full | Nonlinear Radiation Damping: A New Method for Dissipating Energy in Dynamic Earthquake Rupture Simulations |
| title_fullStr | Nonlinear Radiation Damping: A New Method for Dissipating Energy in Dynamic Earthquake Rupture Simulations |
| title_full_unstemmed | Nonlinear Radiation Damping: A New Method for Dissipating Energy in Dynamic Earthquake Rupture Simulations |
| title_short | Nonlinear Radiation Damping: A New Method for Dissipating Energy in Dynamic Earthquake Rupture Simulations |
| title_sort | nonlinear radiation damping a new method for dissipating energy in dynamic earthquake rupture simulations |
| url | https://doi.org/10.1785/0320230001 |
| work_keys_str_mv | AT michaelbarall nonlinearradiationdampinganewmethodfordissipatingenergyindynamicearthquakerupturesimulations AT ruthaharris nonlinearradiationdampinganewmethodfordissipatingenergyindynamicearthquakerupturesimulations |