Models for Fault Behavior Elastic Rebound: –Pre-earthquake strain is gradual in space and time...
-
Upload
esther-flynn -
Category
Documents
-
view
215 -
download
0
Transcript of Models for Fault Behavior Elastic Rebound: –Pre-earthquake strain is gradual in space and time...
![Page 1: Models for Fault Behavior Elastic Rebound: –Pre-earthquake strain is gradual in space and time –Earthquake strain is abrupt in space and time.](https://reader035.fdocuments.us/reader035/viewer/2022062519/5697bfa61a28abf838c9839e/html5/thumbnails/1.jpg)
Models for Fault Behavior
• Elastic Rebound:– Pre-earthquake
strain is gradual in space and time
– Earthquake strain is abrupt in space and time
![Page 2: Models for Fault Behavior Elastic Rebound: –Pre-earthquake strain is gradual in space and time –Earthquake strain is abrupt in space and time.](https://reader035.fdocuments.us/reader035/viewer/2022062519/5697bfa61a28abf838c9839e/html5/thumbnails/2.jpg)
Our Classic View of Fault Behavior
Fast Slip Earthqua
ke(minutes)
Slow Slip
Tremor(days)
A New View of Fault Behavior
![Page 3: Models for Fault Behavior Elastic Rebound: –Pre-earthquake strain is gradual in space and time –Earthquake strain is abrupt in space and time.](https://reader035.fdocuments.us/reader035/viewer/2022062519/5697bfa61a28abf838c9839e/html5/thumbnails/3.jpg)
Episodic Tremor and Slip• Discovered in 2003, observations near Vancouver
revealed the correlation in time and space of GPS detected slow slip (top) and tremor vibrations (bottom)
• These episodes typically last 2 weeks and recur in this region nearly every 14 months
Rogers and Dragert, 2003
![Page 4: Models for Fault Behavior Elastic Rebound: –Pre-earthquake strain is gradual in space and time –Earthquake strain is abrupt in space and time.](https://reader035.fdocuments.us/reader035/viewer/2022062519/5697bfa61a28abf838c9839e/html5/thumbnails/4.jpg)
Cross-Section of Fault Behavior
• What kind of fault is this?• Shallow fault: Locked -> Earthquakes• Deeper fault: Transition -> Tremor and Slip• Changes in temperature and dehydration
affect frictional properties of fault
Dragert et al., 2000
![Page 5: Models for Fault Behavior Elastic Rebound: –Pre-earthquake strain is gradual in space and time –Earthquake strain is abrupt in space and time.](https://reader035.fdocuments.us/reader035/viewer/2022062519/5697bfa61a28abf838c9839e/html5/thumbnails/5.jpg)
Sumatra, Indonesia
Earthquakes from 1964-2004
Dec. 26, 2004 eventMar. 28, 2005 event
Locked Fault Aftershocks
![Page 6: Models for Fault Behavior Elastic Rebound: –Pre-earthquake strain is gradual in space and time –Earthquake strain is abrupt in space and time.](https://reader035.fdocuments.us/reader035/viewer/2022062519/5697bfa61a28abf838c9839e/html5/thumbnails/6.jpg)
This Is Why It Is Important
CascadiaSumatra