martes, 20 de enero de 2009

Naturally occurring earthquakes

Tectonic earthquakes will occur anywhere within the earth where there is sufficient stored elastic strain energy to drive fracture propagation along a fault plane. In the case of transform or convergent type plate boundaries, which form the largest fault surfaces on earth, they will move past each other smoothly and aseismically only if there are no irregularities or asperities along the boundary that increase the frictional resistance. Most boundaries do have such asperities and this leads to a form of stick-slip behaviour. Once the boundary has locked, continued relative motion between the plates leads to increasing stress and therefore, stored strain energy in the volume around the fault surface. This continues until the stress has risen sufficiently to break through the asperity, suddenly allowing sliding over the locked portion of the fault, releasing the stored energy. This energy is released as a combination of radiated elastic strain seismic waves, frictional heating of the fault surface, and cracking of the rock, thus causing an earthquake. This process of gradual build-up of strain and stress punctuated by occasional sudden earthquake failure is referred to as the Elastic-rebound theory

martes, 13 de enero de 2009

New Year Resolutions

Paula:
I am going to study more
I am going to go shopping
I am going to meet whit my friends
I am going to learn lessons
I am going to eat vegetables

Beatriz:
I am going to study very good.
I am going to listen to my brother
I am going to read more
I am going to help to my mather
I am going to go shopping.

martes, 9 de diciembre de 2008

buenas!

hi! We are ourselves! that you are? us very well because we had our bridge and we have gone very well what we heard music, stayed with friends ... I hope this blog entertains good. we are going a kiss: Pauna and bea:)

jueves, 4 de diciembre de 2008

Our favourite clothes

We love going to shopping. Every week, we go once time. We like visiting many shops, as Zara, bherska o Mango, but our favourite is Bershka. We buy trousers, t-shirt, coats... at Bershka.

martes, 2 de diciembre de 2008

hi! good just tell you that this blog is a bit boring because the truth we do not know much English So forgive us know and appreciate thanks many kisses from: paula and bea

martes, 25 de noviembre de 2008

verbos

be
beat
become
begin
bend
bet
bite
bleed
blow
break
bring
build
burn
buy
catch
choose
come

HOW ARE YOU?

Hello! How are you? How old are you?we like the book crepusculo and the filme the el exsorcismo de Emili rose. We like the pizza an our favorite color is the black . This is your block
yours:
beatriz and paula.
goodbye.!!