wiki.geodialog.com
Analytical Tools Constructing a seismicity model, in a nutshell, means formulating a realistic model of earthquake occurrences on a fault, in a subduction zone, or within an area. A modeler would collect: Most seismicity models are formulated as a combination of a Gutenberg-Richter (GR) and a characteristic earthquake model. The Gutenberg-Richter model describes the occurrence…
Analytical Tools Seismicity of the United States: USGS Model Formulation Earthquakes are common throughout the United States, with the highest activity concentrated in the western states, Alaska, and Hawaii. However, the central and eastern U.S. also experiences occasional damaging seismic events. According to the USGS report, 27 states have experienced potentially damaging earthquakes of magnitude…
Analytical Tools Geodetic data provides valuable information on how a region is being strained and its potential to experience earthquakes. Over the last few decades, there have been concerted efforts to develop databases of global surface strain rates, aiming to assess regional earthquake hazards. Figure 1 shows a map of regional strain rates for Europe,…
Read More “Construct Regional Seismicity Models Using Geodetic Strain Rate” »
Sand Box ReadFile Create a user-subduction Import User Subduction Data mm_test test_Mag_rate test_Mag_rate_N0 Hazard_python Hazard_Update AI_Test MM_EQ_MAP This is a test
Plate tectonics provides the unifying theoretical framework for understanding the large‑scale structure and evolution of Earth’s outer shell. Emerging in the mid‑20th century from the synthesis of continental drift, seafloor spreading, and global seismic observations, the theory describes how the rigid outermost layer of the planet behaves as a mosaic of mobile plates driven by…
Interactive Global Distribution of Earthquakes and Tectonic Plates Earth’s surface is not a single unbroken shell but a mosaic of tectonic plates that slowly move over the planet’s interior. Where these plates meet, they interact in powerful ways: some collide and force one plate beneath another, some pull apart to create new crust, and others…
Decades of research have produced methodologies for interpreting regional rates of surface strain‑rate measurements in terms of regional rates of seismic moment accumulation. Because seismic moment quantifies the strain released by earthquakes, framing regional strain buildup in terms of moment rate offers a meaningful way to assess the potential for future seismic activity. In this…
The sandbox modules on this page are designed to allow users to define crustal earthquake scenarios worldwide to conduct ground motion (GM) analysis at their sites of interest. The practical applications of this capability are: Two modules are designed to achieve the objectives: The impacts of different tectonic environments on earthquakes GMs are accommodated by…
Read More “User-Based Global Earthquake Scenarios for Ground Motion Analysis” »
The following briefly discusses constructing an earthquake scenario using a user-defined fault database. For details, see Create Crustal Fault Database. It is assumed that a fault database is created using Construct Earthquake Scenarios and Conduct Ground Motion Analysis sandbox or other means outside the program. As shown in Figure 1, the user-stored segment data is…
Read More “Constructing Earthquake Scenarios for GM Analysis” »
The following is a brief discussion on creating and saving a database of fault segments. The segments created by this module can be used in the Construct Earthquake Scenarios and Conduct Ground Motion Analysis module to simulate multi-segmented earthquake scenarios for GM analysis. Figure 1 shows a sample page for creating a fault segment, in…