USGS M 2.5+ Earthquakes

Thursday, October 13, 2011

Earthquake in Bali

An earthquake measuring 6.8 on the Richter scale shook the island. The quake was centered at a depth of 10 kilometers from the sea surface.

The information reported by the Meteorology and Geophysics (BMKG) states that an earthquake measuring 6.8 magnitude occurred at about 10:16 pm in Nusa Dua, Bali,Thursday, October 13, 2011.

Epicenter is in a location known to 9.89 south latitude and 114.53 east longitude. Epicenter was located at a distance of 143 kilometers southwest direction, Nusa Dua, Bali.

Saturday, September 24, 2011

Is the Earth causing an explosion in an earthquake, or vice versa?

Actually this question is posed by the opinion of Western scholars about the Continents drifting that are constantly moving. With this theory they have been aware of any earthquake million times every year on this planet. But they forget that the skin of the Earth has been very strong in fact rigorously very tight, therefore lies the sea water two-thirds of the entire surface as are people not afraid to sail anywhere without feeling the landslide will fall into the bowels of the Earth.
Continental Drift with full description as a theory, first published by Alfred Wegener, meteorological Germany, in 1912. He explained that once approximately 200 million years ago the continent of Pangaea had split, each split into several continents to date and its islands. Unfortunately he did not explain the disintegration of Pangaea , hence the theory is not complete as it is said, but the emotion that caused the alleged shaped by circumstances and experiences that befall. He's just based on the shape of continents that ultimately fit connected, as well as fossils and animals that almost simultaneously on the continents. Until now the Earth's lands are still moving and causing catastrophic earthquakes and death.

There're 1,200 seismograph stations that recorded 500 000 shocks each year on Earth, of which 100,000 can be heard and felt the population, and 1,000 times have been disastrous. Four and five earthquakes around the Pacific force while others are around India, the Mediterranean and Atlantic.
But in I950 there arose a great challenge among geophysicists to continental drift theory on the grounds that the skin of the Earth at the bottom of the ocean has been very loud and strong that it does not allow entry into force of the continents shift. But in 1960, broke again to defend the opinion of Alfred Wegener's theory by arguing that strengthen annotations.
A clear shift in the position of the continents is called continental drift had no compelling reason and logic unacceptable reasonable, because the distance between each of the continents and islands are so far away, some even thousands of miles. Plus the Earth's surface is composed of 2 per 3 oceans rather than land.
Now we return to the question, whether the explosion that caused the earthquake or an earthquake caused an explosion?

The answer is that both are the same, the quake caused the explosion also caused the earthquake itself. The problem is the cause of both. People divide the two kinds of earthquakes, which is caused by tectonic movements of the Earth's strata, and volcanic eruptions caused by the mountain. Tectonic earthquake is just a continuation of the theory of Continental Drift is no good reason, while volcanic earthquake is the result of akfitivas magma within the Earth, up to carrying up to a million times smaller large earthquakes in one year.

Thursday, September 22, 2011


Small earthquakes do not always mean the introduction of a major earthquake.
A small earthquake could be triggered by human activities such as filling the reservoir and the injection of liquid into the wells to improve oil quality and waste. Recorded several cases in several U.S. territories, Canada, Japan and India.
The biggest earthquake occurred in Chile on 22 May 1960, with the strength of 9.5 on the Richter scale. Seismic waves shaken the earth for days, this phenomenon is called with earth free Oscillation.
Seismoscope first pendulum to measure the vibrations of the earth during an earthquake is made in the year 1751.

1855, the fault was first recognized as a source of the earthquake.
Hypocenter earthquake is the location below the earth's surface where the fracture begins to crack.
The earthquake epicenter is the location right above the hypocenter on the surface of the Earth.
It is estimated that every year 500,000 detectable earthquakes in the world. As many as 100,000 of them can be felt, and 100 of them cause damage.

Magnitude quake measured based on the size of the earthquake. In the measurement of vibration is felt everywhere, magnitudenya is the same.
Earthquake intensity is measured by the vibration caused by the earthquake. The numbers vary at each location affected by the earthquake effects.
There was no earthquake due to weather.
Most earthquakes occur at depths of less than 80 km below the Earth's surface.
The earliest recorded earthquake in full is the earthquake in Shandong, China in 1831 BC. Note pickup began in 780 BC during the reign of Zhou Dynasty in China.

Aristotle in 350 BC found that the soft surface to shake harder than the hard surface during an earthquake.
In 1760 British engineer John Michell recorded earthquakes are caused by the shifting masses of rock below the surface.
Most earthquake waves have a frequency of less than 20 Hz. So a human audible roar is the sound of objects that are shaken.

Plate Tectonic Theory

Plate Tectonic Theory  is a theory in the field of geology which was developed to provide an explanation for the existence of evidence of large-scale movements performed by the Earth's lithosphere. This theory has been included and also replaced the Continental Drift Theory which first put forward in the first half of the 20th century and the concept of seafloor spreading developed in the 1960s.
The outer portion of Earth's interior is formed from two layers. At the top there is the lithosphere consists of crust and upper mantle of a rigid and dense. Under the layers of the lithosphere there is asthenosphere its shaped solid but can flow like a liquid with a very slow and the geological timescale is very long because the viscosity and shear strength (shear strength) is low. Deeper, the mantle below the asthenosphere to be more rigid nature again. The cause is not a cooler temperature, but high pressure. 

Layers of the lithosphere is divided into tectonic plates (Tectonic plates). On earth, there are seven major plates and many plates are smaller. These lithospheric plates ride on the asthenosphere. They are moving relative to each other at plate boundaries, both divergent (away), convergent (collide), or transform (sideways). Earthquakes, volcanic activity, mountain formation, and formation of oceanic trenches are all generally occurs in areas along plate boundaries. The lateral movement of the plates is typically 50-100mm / year.

Wednesday, September 21, 2011

The Cause of Earth’s Largest Environmental Catastrophe

Siberian Traps and their relation to the mass extinction 250 million years ago.

Wow this is quite interesting article to read posted by GFZ German Research Centre for Geosciences.

 The eruption of giant masses of magma in Siberia 250 million years ago led to the Permo-Triassic mass extinction when more than 90 % of all species became extinct. An international team including geodynamic modelers from the GFZ German Research Centre for Geosciences together with geochemists from the J. Fourier University of Grenoble, the Max Plank Institute in Mainz, and Vernadsky-, Schmidt- and Sobolev-Institutes of the Russian Academy of Sciences report on a new idea with respect to the origin of the Siberian eruptions and their relation to the mass extinction in the recent issue of Nature (15.09.2011, vol. 477, p. 312-316). 

For detail here

Animated model of the lithosphere destruction by the mantle plume