Example Email Preview — This is what subscribers receive after an earthquake.   ← Back to Registration
● Intensity Lab

Shaking at Caltech Seismological Laboratory was LIGHT — MMI IV, 187.8 km from the epicenter

Light — felt by many indoors; dishes and windows rattle

Modified Mercalli Intensity Scale

I
II
III
IV
V
VI
VII
VIII
IX
X
Not felt
Weak
Light
Moderate
Strong
Very Strong
Severe
Violent
Extreme

Ridgecrest Earthquake Sequence

Earthquake epicenter map

✚ Epicenter  ·  Small dots: nearby cities (colored by Est. MMI)  ·  Large dots: your site(s) (colored by Est. MMI)  ·  Map © OpenStreetMap contributors © CARTO

Max Est. MMI VIII Severe at Searles Valley
Magnitude M7.1
Local Time 8:19 PM PT, July 5, 2019
UTC 03:19:53, July 6, 2019
Depth 8 km
Epicenter 35.7695°N, -117.5993°
Event ID ci38457511

● Your Registered Sites

Caltech Seismological Laboratory 187.8 km from epicenter
ShakeMap MMI IV Light
PGA 1.5267 g
PGV 2.50 cm/s
Site Vs30 760 m/s (Default (760 m/s))

Vs30 is the average seismic wave velocity in the top 30 m of soil. Lower values indicate softer ground that amplifies shaking.

Model Comparison (MMI)

NGA-West2 ground motion prediction equations re-run at this site's Vs30. These are physics-based estimates; ShakeMap is the interpolated observation.

Method MMI
ShakeMap (interpolated) IV
ASK14 — Abrahamson et al. (2014) II
BSSA14 — Boore et al. (2014) II
CY14 — Chiou & Youngs (2014) III
CB14 — Campbell & Bozorgnia (2014) II

● Nearby Cities (ShakeMap MMI)

Shaking at the closest named locations in the Intensity Lab gazetteer:

Location Region Dist (km) MMI
Searles Valley CA 17.6 VIII Severe
Ridgecrest CA 17.6 VIII Severe
China Lake Acres CA 20.7 VII Very Strong
Inyokern CA 23.6 VII Very Strong
Weldon CA 63.4 V Moderate
Kernville CA 74.5 V Moderate
Wofford Heights CA 77.6 V Moderate
California City CA 79.7 V Moderate
Lake Isabella CA 80.7 V Moderate
Bodfish CA 83.1 IV Light
Boron CA 85.8 IV Light
Alta Sierra CA 86.2 IV Light
North Edwards CA 86.3 V Moderate
Death Valley CA 88.1 V Moderate
Mojave CA 95.2 IV Light

● MMI vs Distance Plots

These plots compare NGA-West2 GMPE predictions (colored lines) against ShakeMap interpolated MMI values (gray dots) at all gazetteer sites. Closer agreement means the ground motion models align well with observed shaking for this event.

Site-Specific Vs30 (760 m/s at Caltech Seismological Laboratory)
MMI vs Distance — Site-Specific Vs30
Default Vs30 — 760 m/s (rock-site reference)
MMI vs Distance — Default Vs30 (760 m/s)

Plot lines: ASK14, BSSA14, CY14, CB14 (NGA-West2 GMPEs). Dots: ShakeMap interpolated MMI at gazetteer sites.

View Full Event Details →

You received this because you have sites registered on Intensity Lab.

Contact: support@intensitylab.com  ·  Unsubscribe