My pets don't seem agitated but there is research in the field of animals being sensitive to earthquakes due to their sensitive hearing. Additionally
with the large increase of tropical storms perhaps the dogs/animals are sensing this pressure differential as well.
This also reminds me of the stories of the elephants taking off prior to the sunami striking. They actually snapped their chains indicative of their
desperation to get out of harms way.
My dogs also sense the spirits around our house. In fact we had a friends dog stay with us who followed something around our house the during her
entire visit. Our dogs look in the same areas and I will have to try the pendulum trick as well.
Here is a neat article from rense.com from a few years ago on the topic.
90,000 Chinese Saved By
Lone Animal Quake Prediction
Animals have a great sense of knowing things before they happen. House pets seem to know that their owner will be coming home, even before they
arrive. They don?t receive any physical signals, but they still wait by the door or window to wait for their owner. Homing pigeons also use this
ability although it is not fully understood. Many pet owners say that they have some sort of psychic bond or telepathic link with their pets. Some
pets even act strangely before an earthquake hits.
David Jay Brown, a graduate student was in a university laboratory with three calm rabbits. Suddenly, they became noticeably agitated. They were
hopping around in their cages wildly for five minutes, and then a 5.2 earthquake hit the school!
In China on February 4, 1975, the people of Haicheng were successfully evacuated right before a 7.3 magnitude earthquake hit the school! The decision
to evacuate the city was taken primarily because of the strange behavior of animals. Most of the city was destroyed but all of the people in the city
were evacuated before the earthquake. Almost 90,000 lives were saved.
James Berkalnd, a California geologist, says that he can predict an earthquake just by counting missing pet ads in the newspaper and correlating this
relationship to lunar-tide cycles. He claims to have 75% accuracy using this method. James has been saving and counting missing pet ads for many
years. He says that when the number of missing pet ads goes up, there is probably going to be an earthquake.
Although the majority of accounts pertain to cats and dogs, there are also many stories about other animals acting this way, like horses, cows, deer
and other animals. The times that this usually happens is a couple weeks before and a few moments before an earthquake.
Marsha Adams, an independent earthquake researcher in San Francisco, claims that she has created sensors that can pick up low-frequency
electromagnetic signals which allow her to predict earthquakes with over 90% accuracy. She suspects that low-frequency electromagnetic signals created
by the fracturing of crystalline rock deep inside the earth along fault lines, are "biologically active", and that her instruments are picking up
the same signals that sensitive animals do. She says that because of her new invention, it makes unusual animal behavior obsolete.
Some people say that they feel an uncomfortable pressure in their head or a persistent headache that lasts for weeks, which suddenly vanishes right
before an earthquake. Magnetite has been found in some animal brains, so Berkland thinks that it? is possible that animals may be reacting to their
own headaches caused by changes in the earth's electromagnetic field. He said that he saw a dog chewing on willow bark, from which aspirin was
derived, before an earthquake, and he believes that the dog was attempting to self-medicate himself for the headache.
So, if your pet starts acting very agitated, you may be in for some earth-shaking activity!