EARTHQUAKE IN MARYLAND: DC AREA ROCKED – WASHINGTON POST
Authorities in a District as great as Montgomery as great as Arlington counties pronounced there were no early reports of damage. Still, many residents were dialing 911 to inform a rumbling.
Mike Blanpied, a geologist with a U.S. Geological Survey, was online Friday, Jul 16, during eleven a.m. ET to plead a earthquake.
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Mike Blanpied: Good morning. Lots of people in a DC metro area were awoken (or startled, if already awake) by this morning’s M3.6 earthquake, customarily after 5 am. I’ll answer your questions about a earthquake, a story of earthquakes in a area, as great as any alternative questions we competence have about earthquakes as great as trembler hazards, over a subsequent hour. we conclude your interest.
Mike Blanpied: For a single some-more report about this as great as alternative trembler topics, greatfully see a web site http:/
While there, we inspire we to fill out a “Did we feel it?” form about a quake. 12,000 people have already submitted their observations, assisting to set up a map, color-coded by zip code, display a energy of jolt in a area.
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Leesburg, Va.: The USGS Web site classifies this morning’s eventuality as a “significant earthquake.” When was a final time a Washington, D.C., segment gifted a poignant trembler eventuality prior to to this morning?
Mike Blanpied: This competence be largest trembler to have jarred a incomparable DC metro area given we’ve been measuring earthquakes here. It turns out which a area does not believe many quakes vast sufficient to feel, nonetheless there have been a superficial believe of M2 earthquakes over a years. Farther afield, there have been incomparable earthquakes in southern PA, in DE, as great as in executive as great as southwestern VA, as great as a tiny of those have been vast sufficient to do damage.
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Riverdale, Md.: Realistically, with a trembler centered where it was, could we have felt it/would it have woken me up in College Park/Riverdale, Md.?
I know we woke up during a tiny indicate early this sunrise since my windows rattled as great as we wondered if my son had come in as great as slammed a door, yet a clap didn’t appear to be right for that.
Mike Blanpied: Yes, there have been positively many people in your area who reported feeling a earthquake. See a “Did we feel it?” map to see a energy of jolt all over a region.
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Fairfax, Va.: we woke up around 5 a.m. this sunrise as great as suspicion we was still forgetful since nonetheless we felt a bed as great as walls shake, there was no receptive to advice of a upheaval itself. we suspicion we was starting crazy.
Anyway, how mostly do earthquakes begin in a DC/VA/MD area, how many earthquakes have been available for this area, as great as how clever was a strongest trembler to set upon a area?
Mike Blanpied: There have been not many earthquakes available right around here, yet a area is infrequently jarred by ones in a region. Our USGS National Earthquake Information Center (NEIC) has rebuilt this outline of a chronological seismicity of a region:
Earthquakes in Maryland as great as Northern Virginia have been odd yet not unprecedented. In a past 4 decades, there have been about a dozen bulk 2.0 as great as aloft earthquakes inside of 100 km of this new earthquake. The largest trembler upon jot down in Virginia is a bulk 5.6 in Giles County upon May 31, 1897. More not prolonged ago in a broader area, a bulk 4.1 trembler struck Lancaster County, Pennsylvania upon Apr 22, 1984. This Pennsylvania trembler caused slight repairs during Conestoga, Lampeter, Mt Nebo as great as New Providence as great as was felt from West Virginia to Connecticut. A array of small, felt earthquakes travelling Mar to Jul 1993 occurred nearby Columbia, Maryland, inside of 33 km (20 miles) of a Jul 16, 2010 earthquake. The largest in this array was a bulk 2.7 in March, 1993. On May 5, 2003 a bulk 3.9 eventuality struck nearby Cartersville, Virginia about mid in in in in between Charlottesville as great as Richmond. That trembler was felt during vast in executive Virginia as great as in tools of Maryland. The many new trembler in this segment was a bulk 2.0 eventuality upon May 6, 2008 nearby Annandale, Virginia.
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Bethesda, Md.: How come my cats as great as dog did not conflict prior to to or during a earthquake?
Mike Blanpied: Many animals responded to a jolt of a earthquake, since they have been supportive to even slight shaking.
However, a earth did not give any denote which a trembler was about to occur–although from time to time there have been claims of “animal trembler prediction,” it has never been demonstrated which animals have a special capability in this area. In fact, a earth competence not give any notice during all!
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New York, N.Y.: The Post reports which a upheaval was felt in West Va., as great as in Pennsylvania — since was such a tiny upheaval (3s mostly have been described similar to a vast lorry starting by) felt over such a vast distance? is there something special about a geology of a segment which allows a startle waves to spread?
Mike Blanpied: Good question…. It turns out which a old, cold rocks of a executive as great as eastern US have been unequivocally great during transmitting seismic waves over vast distances. Even a medium trembler similar to this a single can be felt a hundred miles or some-more away. Out west, where a rocks have been younger as great as some-more shop-worn up by new geologic activity, they have some-more earthquakes yet any a single shakes a not as large area.
Recall a M5.0 trembler in southern Quebec a integrate of weeks ago? It was felt in nineteen US States as great as many Canadian Provinces!
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Kensington, Maryland: How prolonged did today’s upheaval last?
Mike Blanpied: The trip upon a error underneath belligerent substantially customarily lasted a second or two. But which trip sent a pour out of seismic waves roving out in all directions. People vital a tiny miles divided felt jolt for 5 to 10 seconds or so. (And whilst that’s happening, 10 seconds can feel similar to a unequivocally prolonged time!)
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washingtonpost.com: Did we feel it? — Tell us! (USGS)
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Nokesville, VA: I’m confused. we suspicion DC sat in a center of a tectonic plate. Are there alternative events upon top of image movements which means earthquakes… as great as if so, do we know what caused this one?
Mike Blanpied: You’re right–we have been in a interior of a North American tectonic plate, which stretches from a San Andreas error as great as Cascadia seashore in a west, to a center of a Atlantic sea to a east. However, a complete image is underneath stress, as great as there have been earthquakes which means there to be jeopardy in a infancy of a states.
The USGS publishes a seismic jeopardy map for a US, which serves as a basement for seismic office office office office building formula standards adopted by states as great as towns opposite a country. For a duplicate of which map, see a Fact Sheet here: http:/
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D.C.: I’ve seen a tiny smatterings (mostly in comments sections) around a Web which this competence be continuous to a top in a future being successful in a Gulf. Of course, anything is possible, yet how expected do we cruise which is?
Mike Blanpied: Not possible. The forces behaving in a membrane around a cove great have been internal to which area, as great as a faults in a area reply to stresses nearby them. The cove is distant as great private from a DC area for their to be a link.
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washingtonpost.com: 2008 United States National Seismic Hazard Maps (USGS)
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Arlington, VA: What do we meant by M2 as great as what is a illusive means of this earthquake?
Mike Blanpied: The M stands for Magnitude, as great as is a bulk of a appetite of a earthquake. We theory a appetite regulating seismic recordings from seismometers decorated via a region. The “Learn” add-on upon a web site http:/
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Atlanta, Ga.: Which area of a United States is a slightest receptive to earthquakes, even of a tiny magnitude? Would it be a Great Plains?
Mike Blanpied: As you’ll see upon a seismic jeopardy map (see above), a north executive states as great as furthest southeast have unequivocally low seismic hazard. (They do have their share of continue hazards, however!)
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Rockille, Md.: we listened a loud, low rumbling receptive to advice during a quake. What was this sound?
Mike Blanpied: Lots of people reported conference sounds during a earthquake, which is utterly typical. Some of which comes from a jolt of a belligerent itself, as great as a tiny comes from a rattling as great as slipping as great as shifting of joints as great as connectors inside of a building. Some buildings have unequivocally particular sounds which competence be listened even when a jolt is as great light to be felt!
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Rockville MD: What is a luck of serve earthquakes after this one? we know they come in clusters. When have been a conditions “back to normal”?
Mike Blanpied: After any trembler there is a possibility of aftershocks, as great as spasmodic those aftershocks competence themselves be vast sufficient to means damage. With a thoroughfare of time, which jeopardy dies divided as great as we lapse to a usual turn of jeopardy in this area, which stays medium yet not zero.
The many appropriate thing to do is to let this trembler be a sign which we do have a jeopardy here, as great as to cruise receiving a couple of elementary stairs to be certain which you’re protected during work as great as home if a incomparable a single strikes. One of a many drawn out inconveniences caused by earthquakes is a energy outage which additionally affects communications; so it’s great to have a devise in place for energy outages, which competence be permitted for blackouts caused by any alternative means as well.
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Baltimore, Md.: For tall bookcases, people in regions with stronger quakes mostly insert an anti-tipping tag from a bookcase to a wall. In a area, do associating people such as specialists in earthquakes cruise we do which in their own houses? What is a rise enlarge in speed indispensable to tip a tall shelf, or hit equipment off?
Mike Blanpied: It unequivocally does not take many jolt to means tall seat to topple, or for cinema to tumble off a wall as great as separate shop-worn glass. Speaking for myself, we would take a couple of mins indispensable to secure a many exposed of those objects, generally if they have been in sleeping areas or areas which kids or pets competence occupy. For report upon these as great as alternative elementary preparedness steps, see a Prepare add-on upon a web site.
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Silver Spring, MD: What is a name of a error obliged for this morning’s earthquake?
Mike Blanpied: We do not know that, as great as competence never know. The earth is riddled with faults, as great as even utterly a tiny a single could have hosted this morning’s earthquake. It’s illusive which it occurred upon a error which does not strech a earth’s surface, in which box it would not even have a name (even if we know it exists).
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Bethesda, MD: I, similar to many out there, was woken up by this morning’s quake, as great as a receptive to advice as great as transformation was utterly clear in a early sunrise calm of my bedroom. But we wonder, if this same upheaval had occurred after in a day once folks were up as great as about their routines, if a reactions would have been a same. My subject is, presumption preferred conditions (i.e. quiet, still surroundings) what is a lowest bulk trembler which humans could feel? Thanks.
Mike Blanpied: It is usual for a bulk 3 trembler to be during vast felt in a eastern US, as great as earthquakes even as tiny as M2.0 can be felt locally (assuming there have been people vital in a area). Once we get down to which bulk or below, a tiny earthquakes will not be felt during all.
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washingtonpost.com: Earthquake Hazards Program: Prepare (USGS)
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Hartford, Conn.: Is there any couple in in in in between a vast volume of oil leaking from a earth in a cove as great as earthquakes?
What displaces a oil? What causes such tall vigour to pull all which oil up?
Mike Blanpied: Again, there is no couple in in in in between a cove oil as great as a trembler up here in MD/VA/DC. The reason which oil is so rarely pressurized during abyss is since of a extensive weight of a overlying rock–everything is unequivocally firmly squeezed which low underground, so when a single provides an shun lane for oil, it can be happy to escape.
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washingtonpost.com: Latest Earthquakes (USGS)
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Gaithersburg, Md.: With a upheaval being 3 miles low as great as a drawn out so quickly…. is there a fill-in devise for checking application lines which infrequently moment yet do not entirely mangle compartment weeks down a road?
Mike Blanpied: Utility companies have great believe of their routes as great as a age as great as relations vulnerabilities which competence exist. The USGS does yield a apparatus called ShakeCast which can support application companies or others to brand energy difficulty spots as great as to prioritize inspections. ShakeCast pushes out a ShakeMap to a user, which being a fast distributed map display a expected jolt in a region–this can be sent inside of 5 mins or less. At a user end, a jolt is compared opposite a list of locations as great as vulnerabilities, as great as energy difficulty spots have been identified as great as notifications sent. ShakeCast was grown by USGS in team-work with a California Department of Transportation (CalTrans), which has tens of thousands of bridges as great as overpasses to keep lane of.
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Gaithersburg, Md.: There have been multiform let communities in this area, a single of which we reside in. Do we have specific reserve recommendations for those of us vital upon aloft floors of buildings? We’re upon a third floor, permitted by staircase.
Mike Blanpied: It’s doubtful which we will be faced with serious office office office office building repairs from earthquakes in a area, yet it’s value meditative about puncture shun routes as great as plans, even if glow is a some-more expected reason we competence have use of it. Depending upon a office building a whole style, jolt can be incomparable upon aloft floors, so there competence be some-more inclination for seat to fall, etc. For multi-family structures with a many-car garage portion as a primary floor, there can be a tiny possibility which a primary floor, with a open construction, to be damaged, or even for which partial of a have up to collapse. This was during vast seen following a 1989 “world series” trembler nearby San Jose, CA.
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Chevy Chase, MD: Were there aftershocks? we suspicion we awakened to a single during 8:05 PM, or was we customarily forgetful of a primary a single which woke me during 5:05 AM?
Thanks Ann Chevy Chase
Mike Blanpied: We have available a single movement so far, a bulk 2.0 upheaval customarily a couple of mins after a first, during 5:16am. There competence have been alternative aftershocks coming which size, as great as vast sufficient to be felt, which were not rescued by a seismometers in a area.
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Great Falls, Va.: Do we cruise this is an denote which we’ll see an enlarge in trembler activity?
Mike Blanpied: we disbelief it, as there’s no denote which we’re saying a citation toward some-more visit earthquakes. Earthquakes competence occur during any time, as great as this a single customarily serves as a sign of which fact.
For a map display a earthquakes available in a area, see: http:/
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Only a cat noticed: We’ve worked tough to get a cat to “request” breakfast during a rsther than in accord with hour, similar to 7 or 8 in a morning, yet had a genuine back-sliding today, with shrill meowing in in in in between 5-ish as great as 5:30 until, of course, breakfast was served.
This morning’s headlines reports competence insist what woke her up!
Mike Blanpied: we cruise you’re right!
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washingtonpost.com: Earthquake video: D.C. area awakens to rumble (AP)
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Germantown, Md.: Is it illusive to envision an trembler prior to it happens? If so, how shortly before? Are earthquakes of aloft magnitudes simpler to detect? Is there any monitoring in this area?
Mike Blanpied: Scientists have been perplexing to find a “holy grail” of trembler presaging for centuries, as great as regulating complicated methods, interpretation as great as earth scholarship for decades, yet success. It competence great be which a earth simply does not yield any denote which a error is about to slip. Or, it competence be which there have been a tiny pointed signs which we competence in a future sense to detect; however, if those signs have been a same for tiny as great as vast earthquakes, we competence still sojourn incompetent to know which a vast trembler is about to strike.
What we DO know is which in accord with courtesy to office office office office building pattern as great as formulation can take a prick out of even a largest quakes. What we’d adore is for a nation to be great sufficient rebuilt which we float out an trembler with frequency a wink of a eye!
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Silver Spring, Md.: Are there ever ‘preshocks’? we was awakened by receptive to advice as great as jolt of my bed a tiny after 2 a.m. How could we find out if this was totalled by USGS?
Mike Blanpied: If there was a tiny foreshock during which time, it was as great tiny to be rescued by a seismic network. All earthquakes vast sufficient to bulk have been rught away put onto a web site.
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Arlington, Va.: Did a trembler feel stronger since it was so shallow? If it were 10 km low rsther than than 3 km low would we have felt a same intensity? Thank you.
Mike Blanpied: For deeper earthquakes, a seismic waves transport by some-more stone prior to reaching a surface, as great as have been thus some-more attenuated. They competence still shake up up a vast area, however, as great as even a unequivocally low trembler can means repairs if it’s vast enough.
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Bethesda, Md.: Can we criticism upon a volume of slippage? Vertical or horizontal? Compass direction? Does this eventuality means we to recalculate a risk estimates for a area? How prolonged to be concerned about aftershocks?
Mike Blanpied: The trembler had a “thrust” sense–i.e., it occurred due to a single square of earth shifting up a error “ramp” relations to another. In this box it occurred due to east-west compression, as great as trip was upon a error dipping possibly to a easterly or a west (one can’t discuss it which a single yet some-more report than we have during this time). we have not distributed a expected slip, yet it would substantially bulk in inches.
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Falls Church, Va.: we woke up this sunrise during 5 a.m. with my bed jolt as great as my things rattling in a shelves. we came downstairs to my mom who didn’t feel a thing! Even yet we were in a same residence as great as she was watchful during a time. She suspicion we customarily had a bad dream. we can’t cruise of a reason she wouldn’t feel a upheaval downstairs, yet is there an explanation? we additionally notice there have been opposite accounts from residents who have felt it or did not feel it even yet they were in a same area, since is that?
Mike Blanpied: That competence have been since a aloft story of a residence shook some-more than a reduce one, due to a office building a whole of a residence as great as a actuality which a aloft story is not as compelled by a foundation. Or it could be which she’s a heavier sleeper!
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Rockville, Md.: we live rsther than tighten to a epicenter — reduction than 5 miles as a bluster flies. we didn’t feel a trembler a bit. My co-worker in NW D.C. felt it. Was we as great tighten to feel it?
Mike Blanpied: No, many people located radically right over a trembler felt it. It’s expected which we happened to be located upon a rsther than stronger square of ground, yet that’s customarily a guess.
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Mike Blanpied: We’ve reached a finish of a hour (and a bit beyond). we conclude all a great questions, as great as additionally your practice from a earthquake, as great as we swallow ones pride if we was incompetent to get to yours.
We’re advantageous to live in a place in which a domestic earthquakes have been customarily some-more resounding than a healthy ones. However, this is a great time to speak with your family, your colleagues, or your property owner about trembler safety, customarily to have certain which nobody will be harm or unduly inconvenienced should a bigger trembler set upon a area. Kids should be taught to “duck, cover as great as reason on” when a earth shakes, as great as family groups should have a devise for how to get in hold as great as how to get home should a energy destroy (or worse) due to an trembler or alternative healthy hazard. Once it happens, it’s as great late to begin planning, so have which review today!
Thanks again, as great as have a great rest of a day.
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