La Habra Earthquake March 2014

QuakeSim and E-DECIDER generated the following products for the M5.1 La Habra, CA earthquake.  Read the OpenHazards blog about this event.

Resources


Disloc results based on  USGS Event Page  and Moment Tensor Solution

 

Model of the 28 March, 2014 M 5.1 La Habra earthquake based on seismic information from the US Geological Survey. The first figure shows what a interferometric radar image may look like. The colors represent motion of the ground toward an eastward flying and northward looking instrument. The white arrows in the second figure show horizontal ground displacement. A seismicity map from the USGS earthquake page (http://earthquake.usgs.gov) shows the aftershock distribution following this event. The next step is to acquire and process data to validate and improve the results. The model is based on a fault 5 km deep that is 9 km long and 3 km wide. It dips upward at a 60° angle and has oblique horizontal slip and thrust slip of 10 cm. Maximum surface displacement for this model is 1 cm, which is at the threshold of what is detectable with NASA's UAVSAR interferometric radar airborne platform.

Version 1 was based on initial mechanism and initial shallow depth. Version 2 was based on revised depth. Version 3 changed fault dimension and slip based on aftershock zone and updated mechanism; reduced slip to allow for a larger fault.

Version 3 Model Generated from Quakesim Anonymous Disloc Service

5 km depth, 9 km length, 3 km wide, 1 cm max slip, consistent with aftershocks

Synthetic Interferogram

La Habra 5km x 9 km Synthetic Interferogram

Displacement Vectors

La Habra 5km x 9 km Displacement Plot

Version 2 Model Generated from QuakeSim Anonymous Disloc Service

5 km depth, 8 mm max slip, consistent with aftershocks

Synthetic Interferogram

View
 

Version 1 Model Generated from QuakeSim Anonymous Disloc Service

1.9 km depth, 5 cm max slip

Synthetic interferogram

View


E-DECIDER Earthquake Forecast Service
 

Forecast Service

Record breaking forecast (29 March 2014)

Southern California Record Breaking Forecast

ETAS (aftershock) forecast (29 March 2014)

Southern California ETAS Forecast


Automatic Disloc Service Model Output
 

Four different scenarios are calculated for each event.
 
  1. Dip Angle=90 degrees, Strike Angle=0 degrees, strike slip, no dip slip
  2. Dip Angle=90 degrees, Strike Angle=45 degrees, strike slip, no dip slip
  3. Dip Angle=45 degrees, Strike Angle=0 degrees, dip slip, no strike slip
  4. Dip Angle=45 degrees, Strike Angle=90 degrees, dip slip, no strike slip
Interferograms are calculated with elevation angle=60, azimuth=0, and frequency 1.26 GHz.
 

Slope Change (Tilt Map) Map

Strain Magnitude Map

Vector Displacement Map

Synthetic InSAR Map

Disloc Calculations

Date: 

Friday, March 28, 2014

Location: 

La Habra, CA