I just heard in the news that there have been 6 mild earthquakes (4.7 the strongest) in the sea close to Paphos, NW coast of Cyprus. The seismologist who spoke said that the next 48 hours are crucial in showing whether that was it, or precursors. As i also read in sott, there have been several earthquakes around the world today.
Cyprus lies where the Eurasian and African plates meet.
Alana Started this post on January 19, 2007, 09:54:41 AM and i thought it might be time for a review, given the activity around the the BBM. A few necessary precautions for safety for your family and personal well being as to being prepared, for if and when the big one strikes. Rather it be made made, or just a
Sign
Of
The
Times. Good luck to all, and preparation "Will" be the key.
The information on this page is from materials created by the Emergency Survival Program (ESP) in 2006, and based on "The Seven Steps to Earthquake Safety" in the handbook, Putting Down Roots in Earthquake Country.
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Putting Down Roots Handbook
Seven Steps to Earthquake Safety
The information on this page is from materials created by the Emergency Survival Program (ESP) in 2006, and based on "The Seven Steps to Earthquake Safety" in the handbook, Putting Down Roots in Earthquake Country.
PREPARE
Step 1: Secure it now!
Reducing and/or eliminating hazards throughout your home, neighborhood, workplace and school can greatly reduce your risk of injury or death following the next earthquake or other disaster. Conduct a "hazard hunt" to help identify and fix things such as unsecured televisions, computers, bookcases, furniture, unstrapped water heaters, etc. Securing these items now will help to protect you tomorrow.
Download the Secure It Now! focus sheet (804 KB PDF -- courtesy Emergency Survival Program)
Step #1 in Putting Down Roots in Earthquake Country
Step 2: Make a plan
Planning for an earthquake, terrorist attack, or other emergency is not much different from planning for a party or vacation. Make sure that your emergency plan includes evacuation and reunion plans; your out-of-state contact person's name and number; the location of your emergency supplies and other pertinent information. By planning now, you will be ready for the next emergency.
Download the Make a Plan focus sheet (436 KB PDF -- courtesy Emergency Survival Program)
Step #2 in Putting Down Roots in Earthquake Country
Step 3: Make disaster kits
Everyone should have disaster supplies kits stored in accessible locations at home, at work and in your vehicle. Having emergency supplies readily available can reduce the impact of an earthquake, a terrorist incident or other emergency on you and your family. Your disaster supplies kits should include food, water, flashlights, portable radios, batteries, a first aid kit, cash, extra medications, a whistle, fire extinguisher, etc.
Download the Make Disaster Kits focus sheet (432 KB PDF -- courtesy Emergency Survival Program)
Step #3 in Putting Down Roots in Earthquake Country
Step 4: Is your place safe?
Most houses are not as safe as they could be. Whether you are a homeowner or a renter, there are things that you can do to improve the structural integrity of your home. Some of the things that you might consider checking include inadequate foundations, unbraced cripple walls, soft first stories, unreinforced masonry and vulnerable pipes. Consult a contractor or engineer to help you identify your building's weaknesses and begin to fix them now.
Download the Is Your Place Safe? focus sheet (620 KB PDF -- courtesy Emergency Survival Program)
Step #4 in Putting Down Roots in Earthquake Country
PROTECT
Step 5: DROP, COVER, and HOLD ON!
Learn what to do during an earthquake, whether you're at home, at work, at school or just out and about. Taking the proper actions, such as "Drop, Cover, and Hold On", can save lives and reduce your risk of death or injury. During earthquakes, drop to the floor, take cover under a sturdy desk or table, and hold on to it firmly. Be prepared to move with it until the shaking stops.
Download the Drop, Cover, and Hold On! focus sheet (480 KB PDF -- courtesy Emergency Survival Program)
Step #5 in Putting Down Roots in Earthquake Country
RECOVER
Step 6: Check it out!
One of the first things you should do following a major disaster is to check for injuries and damages that need immediate attention. Make sure you are trained in first aid and in damage assessment techniques. You should be able to administer first aid and to identify hazards such as damaged gas, water, sewage and electrical lines. Be prepared to report damage to city or county government.
Download the Check It Out! focus sheet (560 KB PDF -- courtesy Emergency Survival Program)
Step #6 in Putting Down Roots in Earthquake Country
Step 7: Communicate and recover!
Following a major disaster, communication will be an important step in your recovery efforts. Turn on your portable radio for information and safety advisories. If your home is damaged, contact your insurance agent right away to begin your claims process. For most Presidentially declared disasters, resources will also be available from federal, state, and local government agencies.
Download the Communicate and Recover! focus sheet (408 KB PDF -- courtesy Emergency Survival Program)
Step #7 in Putting Down Roots in Earthquake Country
http://www.earthquakecountry.info/roots/contents.html#contents
http://www.earthquakecountry.info/roots/socal.html
http://www.earthquakecountry.info/roots/steps.html
http://www.earthquakecountry.info/roots/basics.html
Earthquake Basics
Epicenter, hypocenter, aftershock, foreshock, fault, fault plane, seismograph, P-waves, magnitude, intensity, peak acceleration, amplification...
We hear them. After big earthquakes, we say them. But what do these terms mean? What do they mean for what we felt and what we will feel the next time? Do we really understand what seismologists are saying?
This section describes how earthquakes happen and how they are measured. It also explains why the same earthquake can shake one area differently than another area. It finishes with information we expect to learn after future earthquakes.
Earthquakes and Faults
What is an earthquake?
An earthquake is caused by a sudden slip on a fault, much like what happens when you snap your fingers. Before the snap, you push your fingers together and sideways. Because you are pushing them together, friction keeps them from moving to the side. When you push sideways hard enough to overcome this friction, your fingers move suddenly, releasing energy in the form of sound waves that set the air vibrating and travel from your hand to your ear, where you hear the snap.
The same process goes on in an earthquake. Stresses in the earth's outer layer push the side of the fault together. The friction across the surface of the fault holds the rocks together so they do not slip immediately when pushed sideways. Eventually enough stress builds up and the rocks slip suddenly, releasing energy in waves that travel through the rock to cause the shaking that we feel during an earthquake.
Just as you snap your fingers with the whole area of your fingertip and thumb, earthquakes happen over an area of the fault, called the rupture surface. However, unlike your fingers, the whole fault plane does not slip at once. The rupture begins at a point on the fault plane called the hypocenter, a point usually deep down on the fault. The epicenter is the point on the surface directly above the hypocenter. The rupture keeps spreading until something stops it (exactly how this happens is a hot research topic in seismology).
Aftershocks
Part of living with earthquakes is living with aftershocks. Earthquakes come in clusters. In any earthquake cluster, the largest one is called the mainshock; anything before it is a foreshock, and anything after it is an aftershock.
Aftershocks are earthquakes that usually occur near the mainshock. The stress on the mainshock's fault changes during the mainshock and most of the aftershocks occur on the same fault. Sometimes the change in stress is great enough to trigger aftershocks on nearby faults as well.
An earthquake large enough to cause damage will probably produce several felt aftershocks within the first hour. The rate of aftershocks dies off quickly. The day after the mainshock has about half the aftershocks of the first day. Ten days after the mainshock there are only a tenth the number of aftershocks. An earthquake will be called an aftershock as long as the rate of earthquakes is higher than it was before the mainshock. For big earthquakes this might go on for decades.
Bigger earthquakes have more and larger aftershocks. The bigger the mainshock, the bigger the largest aftershock, on average, though there are many more small aftershocks than large ones. Also, just as smaller earthquakes can continue to occur a year or more after a mainshock, there is still a chance for a large aftershock long after an earthquake.
Foreshocks
Sometimes what we think is a mainshock is followed by a larger earthquake. Then the original earthquake is considered a foreshock. The chance of this happening dies off quickly with time just like aftershocks. After three days the risk is almost gone.
Sometimes, the chance that an event is a foreshock seems higher than average — usually because of its proximity to a major fault. The Governor's Office of Emergency Services will then issue an advisory based on scientists' recommendations. These are the only officially recognized short-term "predictions."
What is a fault?
Earthquakes occur on faults. A fault is a thin zone of crushed rock separating blocks of the earth's crust. When an earthquake occurs on one of these faults, the rock on one side of the fault slips with respect to the other. Faults can be centimeters to thousands of kilometers (fractions of an inch to thousands of miles) long. The fault surface can be vertical, horizontal, or at some angle to the surface of the earth. Faults can extend deep into the earth and may or may not extend up to the earth's surface.
How do we know a fault exists?
* Past fault movement has brought together rocks that used to be farther apart;
* Earthquakes on the fault have left surface evidence, such as surface ruptures or fault scarps (cliffs made by earthquakes);
* Earthquakes recorded by seismographic networks are mapped and indicate the location of a fault.
Some faults have not shown these signs and we will not know they are there until they produce a large earthquake. Several damaging earthquakes in California have occurred on faults that were previously unknown.
Carrizo Plain National Monument along the San Andreas fault
How do we study faults?
Surface features that have been broken and offset by the movement of faults are used to determine how fast the faults move and thus how often earthquakes are likely to occur. For example, a streambed that crosses the San Andreas fault near Los Angeles is now offset 83 meters (91 yards) from its original course. The sediments in the abandoned streambed are about 2,500 years old. If we assume movement on the San Andreas has cut off that streambed within the last 2,500 years, then the average slip rate on the fault is 33 millimeters (1.3 inches) per year. This does not mean the fault slips 33 millimeters each year. Rather, it stores up 33 millimeters of slip each year to be released in infrequent earthquakes. The last earthquake offset the streambed another 5 meters (16 feet). If we assume that all earthquakes have 5 meters (5000 millimeters) of slip, we will have earthquakes on average every 150 years: 5000 millimeters divided by 33 millimeters per year equals 150 years. This does not mean the earthquakes will be exactly 150 years apart. While the San Andreas fault has averaged 150 years between events, earthquakes have occurred as few as 45 years and as many as 300 years apart.