Posts Tagged ‘magnitude’
Thursday, October 20th, 2011
[Or rather, make that a 4.0 on the Richter, final answer. That was for the afternoon earthquake. This evening's aftershock at 8:16 PM was a 3.8.]
People in the West Bay could definitely feel this this one today, the one centered beneath UC Berkeley.
It felt like a succession of sharp bumps for a few seconds and then there was some generalized shaking – perhaps it all lasted about six seconds.
The Did You Feel It Map:
The initial estimate was a 4.2:
| Magnitude |
4.2 |
| Date-Time |
- Thursday, October 20, 2011 at 21:41:04 UTC
- Thursday, October 20, 2011 at 02:41:04 PM at epicenter
|
| Location |
37.864°N, 122.249°W |
| Depth |
9.8 km (6.1 miles) |
| Region |
SAN FRANCISCO BAY AREA, CALIFORNIA |
| Distances |
- 2 km (2 miles) ESE (112°) from Berkeley, CA
- 5 km (3 miles) NE (47°) from Emeryville, CA
- 5 km (3 miles) NNW (341°) from Piedmont, CA
- 8 km (5 miles) NNW (346°) from Oakland, CA
|
| Location Uncertainty |
horizontal +/- 0.2 km (0.1 miles); depth +/- 0.4 km (0.2 miles) |
| Parameters |
Nph= 90, Dmin=2 km, Rmss=0.18 sec, Gp= 22°,
M-type=local magnitude (ML), Version=3 |
| Source |
|
| Event ID |
nc71667366 |
Tags: 20, 2011, 20th, 241, 242, 3.8, 3.9, 4, 4.0, 4.2, afternoon, aftershock, Aftershocks, bay area, Berkeley, california, campus, clark kerr, colleg, did you feel it, dorm, earthquake, east, east bay, EPICENTER, epicentre, fault, feel, felt, filed, hayward, magnitude, map, Oakland, october, p-m, quake, residence, richter, richtor, san andreas, San Francisco, scale, softball, thursday, uc berkeley, university of california, usgs
Posted in events | 6 Comments »
Sunday, November 7th, 2010
Well, run for the hills, Ma Barker – it’s been reported that Danville, CA had an earthquake of magnitude 2.0 on the Richter (or, IRL, moment magnitude) scale this morning.
Now really, is this event worth reporting if nobody even felt it? I mean, don’t we have hundreds of tiny earthquakes going on all the time? So why inform readers about quakes of magnitude 2, or 1, or zero, or less than zero?
Now, what if The Great Danville Micro-Quake of Novembre 7th in the Year of Our Lord Twenty Hundred and Half a Score, well what if it had had about thirty times as much energy? Well, then it would be a 3.0 and people would have felt it and then it’d be worth reporting.
You know where you want to be the next time a Big One comes? The Skidmore, Owings & Merrill-designed state building in San Francisco’s Civic Center. It’s resting on 288 eight-foot hydraulic seismic dampers. Like this one:
Click to expand
Ergo, resolved: Earthquakes with Magnitudes of Less than 3.0 are Not Worth Reporting.
Tags: 2.0, 3.0, danville, earthquake, intensity, less, magnitude, quake, richter, scale, than
Posted in disaster drill, events, media | 3 Comments »
Friday, July 23rd, 2010
This must be a twin of the one we just felt on June 28th. Did You Feel It?
Mag= 3.5 3.2, MMI= IV
All the deets of Event nc71436076:
| Magnitude |
3.5 |
| Date-Time |
- Friday, July 23, 2010 at 21:29:10 UTC
- Friday, July 23, 2010 at 02:29:10 PM at epicenter
|
| Location |
37.665°N, 122.516°W |
| Depth |
6.7 km (4.2 miles) |
| Region |
OFFSHORE NORTHERN CALIFORNIA |
| Distances |
- 5 km (3 miles) NNW (331°) from Pacifica, CA
- 5 km (3 miles) WSW (237°) from Daly City, CA
- 5 km (3 miles) WSW (254°) from Colma, CA
- 15 km (9 miles) SW (215°) from San Francisco City Hall, CA
|
| Location Uncertainty |
horizontal +/- 0.2 km (0.1 miles); depth +/- 0.4 km (0.2 miles) |
| Parameters |
Nph= 75, Dmin=5 km, Rmss=0.13 sec, Gp=104°,
M-type=local magnitude (ML), Version=2 |
| Source |
|
| Event ID |
nc71436076 |
Tags: 2010, 3.2, 3.5, Animals, bay area, california, California Integrated Seismic Net, Caltech, CGS, daly city, district, earthquake, little, magnitude, miles, morning, mussel, nc71416595, nc71436076, ocean, pacific, Pacific Coast Highway, pacifica, pch, quake, richter, rock, San Francisco, snmall, south, tiny, u. s., ucb, UCSD, united states geological survey, UNR, usgs, west
Posted in events | No Comments »
Monday, June 28th, 2010
7:47 AM, June 28th – The bay area just got a few little rolls from an “adorable” quake that had an epicenter just three miles to the west of the San Francisco Zoo, under the Pacific on the San Andreas Fault.
The animals at the zoo are unnerved:
“I can hear the Peacocks at the @sfzoo flipping out over the little earthquake.”
Oh well. Here it is, from the USGS:
| Magnitude |
3.5 |
| Date-Time |
- Monday, June 28, 2010 at 14:47:04 UTC
- Monday, June 28, 2010 at 07:47:04 AM at epicenter
|
| Location |
37.742°N, 122.556°W |
| Depth |
8 km (5.0 miles) |
| Region |
OFFSHORE NORTHERN CALIFORNIA |
| Distances |
- 5 km (3 miles) WNW (284°) from San Francisco Zoo
- 10 km (6 miles) NW (306°) from Daly City, CA
- 11 km (7 miles) NW (309°) from Colma, CA
- 13 km (8 miles) WSW (253°) from San Francisco City Hall, CA
|
| Location Uncertainty |
horizontal +/- 0.2 km (0.1 miles); depth +/- 0.4 km (0.2 miles) |
| Parameters |
Nph= 73, Dmin=9 km, Rmss=0.08 sec, Gp=101°,
M-type=local magnitude (ML), Version=2 |
| Source |
|
| Event ID |
nc71416595 |
Saint Francis of Assisi was all, “Is that what Thouest calls an Earth-Tembler Temblor, Master Andreas? Really, t’was merely a trifling. Next time, Thouest should Bring It On.”
An artist’s depiction of Frank raising the roof in victory over Saint Andy this A.M.:
Still standing, baby!
Tags: 2010, 3.5, Animals, bay area, birds, california, California Integrated Seismic Net, Caltech, CGS, district, earthquake, Earthquake san francisco, flamingoes, little, magnitude, miles, morning, nc71416595, ocean, ocean beach, outer, pacific, parkside, quake, richter, San Francisco, snmall, sunset, tiny, u. s., ucb, UCSD, united states geological survey, UNR, usgs, west, zoo
Posted in events | 5 Comments »
Thursday, January 7th, 2010
It felt like a quick initial jolt followed up by three seconds of shaking to those of us in San Francisco. See what people thought about the latest rumblings of our San Andreas Fault over at SFist.com.
The updated report from the USGS indicates a 4.2 near the city of Milpitas.
Right here, “A” marks the spot:
A light earthquake occurred at 10:09:35 AM (PST) on Thursday, January 7, 2010.
The magnitude 4.2 event occurred 10 km (6 miles) ENE of Milpitas, CA.
The hypocentral depth is 9 km ( 6 miles).
| Magnitude |
4.2 – local magnitude (ML) |
| Time |
Thursday, January 7, 2010 at 10:09:35 AM (PST)
Thursday, January 7, 2010 at 18:09:35 (UTC) |
| Distance from |
Milpitas, CA – 10 km (6 miles) ENE (62 degrees)
Alum Rock, CA – 12 km (8 miles) NNE (12 degrees)
Sunol, CA – 16 km (10 miles) SSE (150 degrees)
San Jose City Hall, CA – 17 km (11 miles) NNE (29 degrees)
|
| Coordinates |
37 deg. 28.6 min. N (37.477N), 121 deg. 47.8 min. W (121.797W) |
| Depth |
9 km (5.6 miles) |
| Location Quality |
Excellent |
| Location Quality Parameters |
Nst= 89, Nph= 89, Dmin=3 km, Rmss=0.08 sec, Erho=0.1 km, Erzz=0.4 km, Gp=36 degrees |
| Event ID# |
nc71336726 |
| Additional Information |
map with fault names
Google Earth KML (Requires Google Earth.)
ShakeMap shaking intensity maps
NCSS First Motion Mechanism 1 |
As per usual, t’was the Northern Calaveras (it means “skulls”) branch of the San Andreas. Alum Rock, will you ever win?
Tags: (BART), 10:09, 10:10, 2010, 4.1, 4.2 magnitude, 7th, Alameda, alum rock, am, bay area, Bay Area Rapid Transit, branch, calaveras, california, Contra Costa, county, earthquake, Earthquake Hazards Program, january, light, magnitude, marin, milpitas, moderate, morning, Muni, resevoir, richter, richtor, san andreas, san francsico, san jose, San Mateo, Santa Clara, scale, sunol, TRACKS, transit, tunnel, U.S. Geological Survey, usgs
Posted in Uncategorized | 8 Comments »
Saturday, June 6th, 2009
We certainly could sense it in San Francisco, anyway, but it definitely was smaller than what occurred on March 30, 2009. No reports of injuries or damage so far. See the deets below. It felt very small in San Francisco. It felt “short and sharp” to those a mile away from the epicenter in the East Bay. At least one “weenie Texan” transplant “thought it was a five.” And Commenter Jane says “It felt like a big truck drove up the street in Point Richmond.”
Those in the State Building in San Francisco’s Civic Center probably didn’t feel a thing. Mayor Gavin Newsom would probably like to remind you about upgrading your “soft story” structure. And good thing City Attorney Dennis Herrera is Suing for Seismic Safety Upgrades at the Mirant Power Plant, right?
Gaia is stirring…
An earthquake occurred at 3:30:56 PM (PDT) on Saturday, June 6, 2009.
The magnitude ? (not yet determined) event occurred 1 km (1 miles) NE of El Cerrito, CA.
The hypocentral depth is 6 km ( 4 miles).
| Magnitude |
3.2 |
| Time |
Saturday, June 6, 2009 at 3:30:56 PM (PDT)
Saturday, June 6, 2009 at 22:30:56 (UTC) |
| Distance from |
El Cerrito, CA – 1 km (1 miles) NE (37 degrees)
Kensington, CA – 2 km (2 miles) NNW (330 degrees)
East Richmond Heights, CA – 3 km (2 miles) SE (139 degrees)
Berkeley, CA – 6 km (4 miles) NNW (345 degrees)
Oakland, CA – 16 km (10 miles) NNW (339 degrees)
|
| Coordinates |
37 deg. 55.5 min. N (37.925N), 122 deg. 17.6 min. W (122.293W) |
| Depth |
6.1 km (3.8 miles) |
| Location Quality |
Excellent |
| Location Quality Parameters |
Nst= 25, Nph= 25, Dmin=4 km, Rmss=0.1 sec, Erho=0.2 km, Erzz=0.5 km, Gp=39.6 degrees |
| Event ID# |
nc40237749 |
| Additional Information |
map with fault names
Google Earth KML (Requires Google Earth.)
Waveforms |
Tags: 2009, 32, 330, 3:31, 6, 6-6, 6th, afternoon, aftershock, ashbury, bay area, Berkeley, california, city attorney, dennis herrera, earth, earthquake, east, el cerrito, el sobrante, estimate, fault, gavin newsom, haight, june, june 6, june 6th, june sixth, kensingtin, magnitude, Mayor, now, Oakland, PM, point, quake, recent, richmond, richmond heights, richter, ricmond heights, san andreas, San Francisco, scale, seismograph, sixth, south bay, tembler, upper
Posted in environment | 3 Comments »
