PAGER - M 3.5 - 14.1 km (8.8 mi) N of Morgan Hill, CA
Alert level does not include impacts from earthquake-related hazards such as tsunamis, landslides, fires or liquefaction.
Earthquake Shaking Alert Level: GREEN
Download Alert PDFWhat's this?Thursday, April 30th, 2009 at 22:50:54 UTC (15:50:54 local)Location: 37.3° N, 121.6° WDepth: 6kmEvent Id: NC51220793Alert Version: 1Created: 73 weeks, 0 days after earthquake.
Alert Information
Green alert for shaking-related fatalities and economic losses. There is a low likelihood of casualties and damage.
Estimated Fatalities
| ESTIMATED FATALITIES (LEVEL) | Probability (%) |
|---|---|
| 0 (GREEN) | 100 |
| 1 to 9 (YELLOW) | 0 |
| 10 to 99 (YELLOW) | 0 |
| 100 to 999 (ORANGE) | 0 |
| 1 to 10 thousand (RED) | 0 |
| 10 to 100 thousand (RED) | 0 |
| 100 thousand + (RED) | 0 |
Estimated Economic Losses
| ESTIMATED VALUE IN USD (LEVEL) | Probability (%) |
|---|---|
| 0 to 1 million (GREEN) | 90 |
| 1 to 10 million (YELLOW) | 9 |
| 10 to 100 million (YELLOW) | 0 |
| 100 million to 1 billion (ORANGE) | 0 |
| 1 to 10 billion (RED) | 0 |
| 10 to 100 billion (RED) | 0 |
| 100 billion + (RED) | 0 |
Detailed Information
| Estimated Modified Mercalli Intensity | I | II-III | IV | V | VI | VII | VIII | IX | X | |
|---|---|---|---|---|---|---|---|---|---|---|
| Est. Population Exposure | 7,802k* | 317k* | 460 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Perceived Shaking | Not Felt | Weak | Light | Moderate | Strong | Very Strong | Severe | Violent | Extreme | |
| Potential Structure Damage | Resistant | none | none | none | V. Light | Light | Moderate | Moderate/Heavy | Heavy | V. Heavy |
| Vulnerable | none | none | none | Light | Moderate | Moderate/Heavy | Heavy | V. Heavy | V. Heavy | |
*Estimated exposure only includes population within calculated shake map area
Population Exposure
Population per ~1 sq. km. from LandScan
Population per ~1 sq. km. from LandScan
Structure Information Summary
Overall, the population in this region resides in structures that are highly resistant to earthquake shaking, though some vulnerable structures exist.
Historical Earthquakes (with MMI)
| Date (UTC) | Dist (km) | Mag | Max MMI (#) | Shaking Deaths |
|---|---|---|---|---|
| 1984-11-26 | 255 | 5.1 | V (17k) | 0 |
| 1989-10-18 | 20 | 6.9 | IX (3k) | 62 |
| 2003-12-22 | 188 | 6.6 | VII (213) | 2 |
Recent earthquakes in this area have caused secondary hazards such as landslides and liquefaction that might have contributed to losses.
Selected Cities Exposedfrom GeoNames Database of Cities with 1,000 or more residents.
| MMI | City | Population |
|---|---|---|
| II | Morgan Hill | 35k |
| II | San Martin | 6k |
| II | Seven Trees | 2k |
| I | Day Valley | 4k |
| I | Alum Rock | 14k |
| I | Corralitos | 2k |
| I | San Jose | 895k |
| I | San Francisco | 732k |
| I | Oakland | 399k |
| I | Stockton | 290k |
| I | Modesto | 216k |
(k = x1,000)
| # | Date/Time | Mag | Lat, Lon, Depth | Country | Max MMI (Exposed) | Deaths | Secondary Effects | |
|---|---|---|---|---|---|---|---|---|
| Shaking | Total | |||||||
| 1 | 1975-08-01 20:20 UTC | 5.8 | 39.5° N, 121.4° W 6km | US | VIII (3 k) | 0 | 0 | |
| 2 | 1978-08-13 22:54 UTC | 5.8 | 34.39° N, 119.64° W 8km | US | VIII (40 k) | 0 | 0 | |
| 3 | 1978-10-04 16:42 UTC | 5.4 | 37.39° N, 118.69° W 8km | US | VI (598) | 0 | 0 | |
| 4 | 1979-08-06 17:05 UTC | 5.7 | 37.07° N, 121.6° W 8km | US | VIII (152) | 0 | 0 | |
| 5 | 1980-01-24 19:00 UTC | 5.8 | 37.71° N, 121.73° W 15km | US | VII (31 k) | 1 | 1 | |
| 6 | 1980-01-27 02:33 UTC | 5.8 | 37.74° N, 121.74° W 15km | US | VI (371 k) | 0 | 0 | |
| 7 | 1980-05-25 16:33 UTC | 6.2 | 37.53° N, 118.83° W 11km | US | IX (72) | 0 | 0 | landslide |
| 8 | 1980-05-25 16:49 UTC | 5.9 | 37.55° N, 119.02° W 3km | US | VIII (16) | 0 | 0 | |
| 9 | 1980-05-25 19:44 UTC | 5.9 | 37.38° N, 118.84° W 4km | US | VII (2) | 0 | 0 | landslide |
| 10 | 1980-05-25 20:35 UTC | 5.9 | 37.44° N, 118.96° W 2km | US | VI (6 k) | 0 | 0 | |
| 11 | 1980-05-25 20:59 UTC | 5.5 | 37.59° N, 118.83° W 10km | US | VII (660) | 0 | 0 | |
| 12 | 1980-05-26 12:24 UTC | 5.6 | 37.58° N, 118.9° W 2km | US | VII (2 k) | 0 | 0 | |
| 13 | 1980-05-26 18:57 UTC | 5.7 | 37.56° N, 118.9° W 6km | US | VII (2 k) | 0 | 0 | |
| 14 | 1980-05-27 14:50 UTC | 5.9 | 37.42° N, 118.8° W 1km | US | VIII (3) | 0 | 0 | |
| 15 | 1981-09-30 11:53 UTC | 5.6 | 37.55° N, 118.8° W 15km | US | VII (591) | 0 | 0 | |
| 16 | 1983-05-02 23:42 UTC | 6.3 | 36.22° N, 120.3° W 10km | US | IX (29) | 0 | 0 | |
| 17 | 1983-05-02 23:46 UTC | 5.7 | 36.23° N, 120.29° W 8km | US | VIII (1 k) | 0 | 0 | |
| 18 | 1983-07-09 07:40 UTC | 5.1 | 36.17° N, 120.37° W 1km | US | VII (10 k) | 0 | 0 | |
| 19 | 1983-07-22 02:39 UTC | 5.7 | 36.2° N, 120.34° W 7km | US | VII (1 k) | 0 | 0 | |
| 20 | 1984-04-24 21:15 UTC | 6.2 | 37.31° N, 121.71° W 9km | US | IX (1) | 0 | 0 | |
| 21 | 1984-11-23 18:08 UTC | 5.8 | 37.34° N, 118.51° W 15km | US | VIII (8 k) | 0 | 0 | |
| 22 | 1984-11-23 19:12 UTC | 5.5 | 37.44° N, 118.64° W 0km | US | VII (381) | 0 | 0 | |
| 23 | 1984-11-26 16:21 UTC | 5.1 | 37.29° N, 118.76° W 10km | US | V (17 k) | 0 | 0 | landslide |
| 24 | 1985-08-04 12:01 UTC | 6.1 | 36.14° N, 120.11° W 15km | US | IX (713) | 0 | 0 | |
| 25 | 1986-01-26 19:20 UTC | 5.4 | 36.75° N, 121.36° W 6km | US | VII (2 k) | 0 | 0 | |
| 26 | 1986-03-31 11:55 UTC | 5.6 | 37.53° N, 121.59° W 6km | US | VII (117) | 0 | 0 | |
| 27 | 1986-07-20 14:29 UTC | 5.8 | 37.5° N, 118.45° W 15km | US | VIII (9) | 0 | 0 | |
| 28 | 1986-07-21 14:42 UTC | 6.2 | 37.5° N, 118.44° W 10km | US | VIII (375) | 0 | 0 | |
| 29 | 1986-07-21 14:51 UTC | 5.7 | 37.5° N, 118.37° W 9km | US | VIII (270) | 0 | 0 | |
| 30 | 1986-07-21 22:07 UTC | 5.4 | 37.64° N, 118.49° W 6km | US | VII (15) | 0 | 0 | |
| 31 | 1986-07-31 07:22 UTC | 5.5 | 37.46° N, 118.4° W 15km | US | VII (210) | 0 | 0 | |
| 32 | 1988-06-27 18:43 UTC | 5.7 | 37.13° N, 121.88° W 13km | US | VIII (6) | 0 | 0 | |
| 33 | 1989-08-08 08:13 UTC | 5.4 | 37.13° N, 121.93° W 15km | US | VII (4 k) | 1 | 1 | |
| 34 | 1989-10-18 00:04 UTC | 6.9 | 37.11° N, 121.77° W 11km | US | IX (3 k) | 62 | 63 | landslide, tsunami |
| 35 | 1991-08-17 19:29 UTC | 6.1 | 40.25° N, 124.11° W 16km | US | VIII (255) | 0 | 0 | |
| 36 | 1992-03-08 03:43 UTC | 5.4 | 40.26° N, 123.97° W 14km | US | VII (53) | 0 | 0 | |
| 37 | 1993-05-17 23:20 UTC | 6.1 | 37.15° N, 117.82° W 10km | US | VIII (6) | 0 | 0 | |
| 38 | 1994-09-12 12:23 UTC | 5.9 | 38.86° N, 119.71° W 5km | US | VIII (14 k) | 0 | 0 | |
| 39 | 1995-09-20 23:27 UTC | 5.5 | 35.63° N, 117.73° W 15km | US | VIII (852) | 0 | 0 | |
| 40 | 1995-12-28 18:27 UTC | 5.5 | 38.78° N, 119.55° W 5km | US | VII (2 k) | 0 | 0 | |
| 41 | 1998-08-12 14:10 UTC | 5.2 | 36.68° N, 121.53° W 9km | US | VII (1 k) | 0 | 0 | |
| 42 | 1999-05-15 13:22 UTC | 5.5 | 37.45° N, 118.8° W 1km | US | VII (4) | 0 | 0 | |
| 43 | 2000-09-03 08:36 UTC | 5 | 38.38° N, 122.41° W 10km | US | VI (77 k) | 0 | 0 | |
| 44 | 2003-12-22 19:15 UTC | 6.6 | 35.62° N, 121.07° W 16km | US | VII (213) | 2 | 2 | landslide, liquefaction |
| 45 | 2004-09-28 17:15 UTC | 6 | 35.75° N, 120.32° W 5km | US | VII (160) | 0 | 0 | |
| MMI | City | Population |
|---|---|---|
| II | Morgan Hill | 35k |
| II | San Martin | 6k |
| II | Seven Trees | 2k |
| I | Day Valley | 4k |
| I | Alum Rock | 14k |
| I | Corralitos | 2k |
| I | Gilroy | 45k |
| I | Amesti | 3k |
| I | Santa Venetia | 5k |
| I | Vine Hill | 3k |
| I | Alameda | 70k |
| I | Alamo | 18k |
| I | Albany | 16k |
| I | Angels Camp | 3k |
| I | Antioch | 106k |
| I | Aptos | 10k |
| I | Aromas | 3k |
| I | Ashland | 23k |
| I | Atherton | 7k |
| I | Atwater | 30k |
| I | August | 9k |
| I | Bay Point | 22k |
| I | Belmont | 24k |
| I | Belvedere | 2k |
| I | Ben Lomond | 3k |
| I | Benicia | 27k |
| I | Berkeley | 100k |
| I | Bethel Island | 2k |
| I | Bolinas | 1k |
| I | Boronda | 1k |
| I | Boulder Creek | 4k |
| I | Brentwood | 47k |
| I | Brisbane | 3k |
| I | Broadmoor | 4k |
| I | Buena Vista | 2k |
| I | Burbank | 5k |
| I | Burlingame | 27k |
| I | Bystrom | 5k |
| I | Cambrian Park | 3k |
| I | Campbell | 37k |
| I | Capitola | 10k |
| I | Carmel Valley Village | 5k |
| I | Carmel-by-the-Sea | 4k |
| I | Castro Valley | 63k |
| I | Castroville | 8k |
| I | Ceres | 40k |
| I | Cherryland | 16k |
| I | Chualar | 2k |
| I | Clayton | 11k |
| I | Colma | 1k |
| I | Columbia | 3k |
| I | Concord | 126k |
| I | Copperopolis | 3k |
| I | Corte Madera | 9k |
| I | Country Club | 10k |
| I | Crockett | 3k |
| I | Cupertino | 51k |
| I | Daly City | 99k |
| I | Danville | 43k |
| I | Del Monte Forest | 4k |
| I | Del Rey Oaks | 2k |
| I | Del Rio | 1k |
| I | Delhi | 12k |
| I | Denair | 3k |
| I | Diablo | 1k |
| I | Discovery Bay | 12k |
| I | Dos Palos | 5k |
| I | Dublin | 39k |
| I | East Foothills | 8k |
| I | East Oakdale | 3k |
| I | East Palo Alto | 33k |
| I | East Richmond Heights | 3k |
| I | El Cerrito | 23k |
| I | El Granada | 7k |
| I | El Sobrante | 14k |
| I | Elkhorn | 2k |
| I | Emerald Lake Hills | 4k |
| I | Emeryville | 8k |
| I | Empire | 4k |
| I | Escalon | 7k |
| I | Fairfax | 7k |
| I | Fairview | 10k |
| I | Felton | 1k |
| I | Firebaugh | 7k |
| I | Foster City | 29k |
| I | Freedom | 6k |
| I | Fremont | 203k |
| I | French Camp | 5k |
| I | Garden Acres | 11k |
| I | Gonzales | 9k |
| I | Grayson | 1k |
| I | Gustine | 6k |
| I | Half Moon Bay | 12k |
| I | Hayward | 140k |
| I | Hercules | 24k |
| I | Hillsborough | 10k |
| I | Hollister | 37k |
| I | Hughson | 7k |
| I | Interlaken | 8k |
| I | Jamestown | 4k |
| I | Kennedy | 4k |
| I | Kensington | 5k |
| I | Kentfield | 7k |
| I | Keyes | 6k |
| I | Lafayette | 25k |
| I | Larkspur | 12k |
| I | Las Lomas | 3k |
| I | Lathrop | 13k |
| I | Lexington Hills | 3k |
| I | Lincoln Village | 4k |
| I | Linden | 1k |
| I | Live Oak | 18k |
| I | Livingston | 12k |
| I | Livermore | 80k |
| I | Los Altos | 27k |
| I | Los Altos Hills | 8k |
| I | Los Banos | 33k |
| I | Los Gatos | 28k |
| I | Loyola | 4k |
| I | Manteca | 66k |
| I | Marina | 17k |
| I | Martinez | 37k |
| I | Menlo Park | 29k |
| I | Merced | 73k |
| I | Mill Valley | 13k |
| I | Millbrae | 20k |
| I | Milpitas | 63k |
| I | Modesto | 216k |
| I | Montara | 3k |
| I | Monte Sereno | 3k |
| I | Monterey | 30k |
| I | Morada | 4k |
| I | Moraga | 17k |
| I | Moss Beach | 2k |
| I | Mountain View | 2k |
| I | Mountain View | 68k |
| I | Newark | 43k |
| I | Newman | 8k |
| I | North Fair Oaks | 16k |
| I | Oakdale | 19k |
| I | Oakland | 399k |
| I | Oakley | 27k |
| I | Opal Cliffs | 7k |
| I | Orinda | 18k |
| I | Pacheco | 4k |
| I | Pacifica | 36k |
| I | Pacific Grove | 15k |
| I | Pajaro | 3k |
| I | Palo Alto | 57k |
| I | Patterson | 16k |
| I | Piedmont | 11k |
| I | Pinole | 20k |
| I | Pittsburg | 63k |
| I | Pleasant Hill | 34k |
| I | Pleasanton | 67k |
| I | Portola Valley | 4k |
| I | Prunedale | 23k |
| I | Redwood City | 72k |
| I | Richmond | 103k |
| I | Ridgemark | 3k |
| I | Rio Del Mar | 9k |
| I | Ripon | 14k |
| I | Riverbank | 19k |
| I | Riverdale Park | 1k |
| I | Rodeo | 9k |
| I | Rollingwood | 3k |
| I | Ross | 2k |
| I | Salida | 17k |
| I | Salinas | 149k |
| I | San Anselmo | 12k |
| I | San Bruno | 40k |
| I | San Carlos | 27k |
| I | San Francisco | 732k |
| I | San Jose | 895k |
| I | San Juan Bautista | 2k |
| I | San Leandro | 80k |
| I | San Lorenzo | 23k |
| I | San Mateo | 90k |
| I | San Pablo | 31k |
| I | San Rafael | 55k |
| I | San Ramon | 45k |
| I | Santa Clara | 102k |
| I | Santa Cruz | 55k |
| I | Saratoga | 29k |
| I | Sausalito | 7k |
| I | Scotts Valley | 11k |
| I | Seaside | 36k |
| I | Shackelford | 6k |
| I | Soledad | 28k |
| I | Soquel | 5k |
| I | South Dos Palos | 2k |
| I | South San Francisco | 59k |
| I | Stanford | 13k |
| I | Stockton | 290k |
| I | Strawberry | 5k |
| I | Sunnyvale | 127k |
| I | Sunol | 1k |
| I | Tara Hills | 6k |
| I | Tiburon | 9k |
| I | Tracy | 83k |
| I | Turlock | 68k |
| I | Twin Lakes | 6k |
| I | Union City | 67k |
| I | Union City | 70k |
| I | Waldon | 6k |
| I | Walnut Creek | 65k |
| I | Waterford | 9k |
| I | Watsonville | 46k |
| I | West Menlo Park | 4k |
| I | Winton | 10k |
| I | Woodacre | 1k |
| I | Woodside | 5k |
(k = x1,000)
PAGER content is automatically generated, and only considers losses due to structural damage. Limitations of input data, shaking estimates, and loss models may add uncertainty. PAGER results are generally available within 30 minutes of the earthquake’s occurrence. However, information on the extent of shaking will be uncertain in the minutes and hours following an earthquake and typically improves as additional sensor data and reported intensities are acquired and incorporated into models of the earthquake's source. Users of PAGER estimates should account for uncertainty and always seek the most current PAGER release for any earthquake.
