M6.9 The 1989 Loma Prieta, California Earthquake: recorded vs. simulated

Recorded

Interior of gym during volleyball game.

Via R0ndom · clip page

Simulated

Day Valley

2 km from the epicentre · Simulated (SCEC BBP simulation, one realization)

Starts the clip where our reviewer marked the shaking and the animation as the first waves reach its site. The alignment is approximate.

What our reviewer saw

MMI VI

Many frightened; many run for shelter or outdoors
A few frightened; some run for shelter or outdoors
Building trembles

One camera's reading is good to about one level.

ShakeMap at the camera

MMI VII

USGS's estimate at the camera, from instruments and reports.

Simulated

MMI VIII · PGA 0.37 g

Simulated for Day Valley, about 34 km from the camera.

Recorded

Oakland freeway.

Via Fierce · clip page

Simulated

Alameda

88 km from the epicentre · Simulated (SCEC BBP simulation, one realization)

Starts the clip where our reviewer marked the shaking and the animation as the first waves reach its site. The alignment is approximate.

What our reviewer saw

MMI X

Most masonry and frame buildings collapse
Bridges destroyed, roads impassable or rails bent
Buildings shifted off foundations or thrown out of plumb

One camera's reading is good to about one level.

ShakeMap at the camera

MMI VII

USGS's estimate at the camera, from instruments and reports.

Simulated

MMI VII · PGA 0.07 g

Simulated for Alameda, the town the clip was filmed in.

Recorded

San Francisco streets.

Via QuakeTV Official · clip page

Simulated

San Francisco

95 km from the epicentre · Simulated (SCEC BBP simulation, one realization)

Starts the clip where our reviewer marked the shaking and the animation as the first waves reach its site. The alignment is approximate.

What our reviewer saw

MMI V

A few frightened; some run for shelter or outdoors
Building trembles
Trees and bushes shaken slightly

One camera's reading is good to about one level.

ShakeMap at the camera

MMI VII

USGS's estimate at the camera, from instruments and reports.

Simulated

MMI VII · PGA 0.07 g

Simulated for San Francisco, the town the clip was filmed in.

Recorded

Apartment in Cupertino

Via Back to the Past · clip page

Simulated

Day Valley

2 km from the epicentre · Simulated (SCEC BBP simulation, one realization)

Starts the clip where our reviewer marked the shaking and the animation as the first waves reach its site. The alignment is approximate.

What our reviewer saw

MMI VI

Many frightened; many run for shelter or outdoors
Heavy furniture moves
Unstable objects tip over

One camera's reading is good to about one level.

ShakeMap at the camera

MMI VII

USGS's estimate at Day Valley, from instruments and reports.

Simulated

MMI VIII · PGA 0.37 g

Simulated for Day Valley, about 24 km from the camera.