What Does Earthquake Magnitude Really Mean?

earthquake magnitude

With two massive earthquakes striking Mexico, less than two weeks apart – one at a 7.1 and one at an 8.1 magnitude – it’s important to understand how seismologist weigh the size of a quake.

According to today’s science, the magnitude of a temblor is determined by the amount of energy released by the shaking.

For an earthquake to go up one whole magnitude, that means the strength of the quake increased by 32 times.

This would mean that a 5 magnitude earthquake is 32 times greater than a 4 magnitude earthquake and that an 8 magnitude earthquake is 1,000 times greater than a 6 magnitude earthquake.

These calculations matter a great deal, especially when examining the difference between the 8.2 earthquake seismologists predict will hit the San Andreas fault (which runs through Los Angeles), in comparison to the 6.7 earthquake that devastated Northridge in 1994.

Magnitude especially matters when talking about active earthquake areas near densely populated regions. That’s why Mexico’s 8.1 earthquake was far less deadly than the 7.1 magnitude earthquake that hit just outside of their capital, Mexico City.

Any earthquake over a 6 magnitude raises concerns. It’s these types of tremors that can damage buildings and move furniture, especially in non-retrofitted structures. While a size 7 magnitude earthquake or greater can throw furniture and inflict damage to the newest of structures.

Also this week, Japan experienced 6.1 earthquake 185 miles from Ishinomaki and New Zealand had a 6.1 earthquake 381 miles from Invercargill.

Now, more than ever, it’s important to be proactive about earthquake preparation and safety.

Julian De La Torre is an expert in Los Angeles foundation inspection, foundation contractors and foundation repair. Julian’s company, Julian Construction, has inspected over 15,000 structures, working with engineering firms and local departments of building & safety. The company has done more foundation repair in Los Angeles than any other company in the area over the last five years.

 

225 personas muertas después de terremoto 7.1 golpea el centro de México

mexico earthquakeJusto a las afueras de la ciudad de México, la capital de México, un devastador terremoto de magnitud 7,1 golpeó el área el martes.

El temblor masivo colapsó 27 edificios en toda la capital, que tomó el peso del daño.

Hasta el momento, 225 personas han muerto debido a la destrucción (y ese número sigue aumentando), con la mayoría de las muertes reportadas en los estados de Morelos y México, y en la Ciudad de México.

Este es el segundo terremoto de magnitud 7+ que golpeó a México en sólo dos semanas, y el último se produjo en el aniversario del temblor destructivo de México de 1985.

No sólo fue el terremoto masivo, también fue superficial, ocurriendo sólo 51 km bajo tierra. Cuanto más bajo es un terremoto, más destructivo tiende a ser.

La presidenta Peña Nieto dijo a los ciudadanos de México: “Estamos ante una nueva emergencia nacional”.

Muchos tomaron a las redes sociales para compartir imágenes del terremoto. -Gracias, Dios, por mantenernos seguros una vez más. Llegamos a experimentar otro terrible terremoto, esta vez durante un scout de localización “, dijo Ricardo Ramos, productor de televisión de Los Ángeles, compartiendo un espeluznante video de la sacudida.

Hace apenas más de una semana, México experimentó un terremoto de magnitud 8,1 frente a su costa sur, que causó la muerte de 90 personas.

Ahora, más que nunca, es importante ser proactivo sobre la preparación y la seguridad del terremoto.

Julian De La Torre es un experto en la inspección de la fundación de Los Ángeles, los contratistas de la fundación y la reparación de la fundación. La empresa Julian, Julian Construction, ha inspeccionado más de 15.000 estructuras, trabajando con empresas de ingeniería y departamentos locales de construcción y seguridad. La compañía ha hecho más reparación de la fundación en Los Ángeles que cualquier otra compañía en el área sobre los últimos cinco años.

225 People Dead After 7.1 Earthquake Strikes Central Mexico

mexico earthquake

Just outside of Mexico City, the capital of Mexico, a devastating 7.1 magnitude earthquake struck the area on Tuesday.

The massive temblor collapsed 27 buildings throughout the capital, which took the brunt of the damage.

So far, 225 people have died due to the destruction (and that number keeps rising), with the majority of the deaths reported from Morelos and Mexico States, and Mexico City.

This is the second 7+ magnitude earthquake to strike Mexico in just two weeks, with the latest one falling on the anniversary of Mexico’s destructive tremor of 1985.

Not only was the earthquake massive in size, it was also superficial, occurring just 51 km below ground. The more shallow an earthquake is, the more destructive it tends to be.

President Pena Nieto told Mexico’s citizens, “We are facing a new national emergency.”

Many took to social media to share footage of the quake. “Thank you, God, for keeping us safe once again. We got to experience another terrible #earthquake, this time during a location scout,” Los Angeles TV Producer Ricardo Ramos shared with a scary video of the shaking.

Just over one week ago, Mexico experienced an 8.1 magnitude earthquake off their southern coast, which killed 90 people.

Now, more than ever, it’s important to be proactive about earthquake preparation and safety.

Julian De La Torre is an expert in Los Angeles foundation inspection, foundation contractors and foundation repair. Julian’s company, Julian Construction, has inspected over 15,000 structures, working with engineering firms and local departments of building & safety. The company has done more foundation repair in Los Angeles than any other company in the area over the last five years.

3.6 El terremoto sacude Los Ángeles, se sentía de Westwood a San Fernando Valley

los angeles earthquake

Afortunadamente, no hubo daños reportados. De hecho, Los Ángeles recibe terremotos de este tamaño con relativa frecuencia.

“Recibimos estos terremotos de tamaño con bastante frecuencia”, el sismólogo Zachary Reeves al Los Angeles Times. “Cualquier daño severo sería bastante improbable”.

Una réplica de 2,0 años siguió al terremoto.

A principios de este mes, se informó que los sismólogos están trabajando para publicar pronósticos de terremotos para el público. Utilizando datos de terremotos más pequeños – similar al shaker de 3,6 del lunes – para predecir terremotos más grandes por venir.

Mientras que se creía previamente que los temblors más pequeños relevan la tensión en líneas de avería importantes, el sismólogo ahora dice que la probabilidad de un terremoto grande se levanta si la actividad sísmica moderada ocurre cerca de una línea de falla grande.

“Los grandes terremotos pueden venir en grupos. Y uno puede desencadenar el otro “, dijo el sismólogo estadounidense Ned Field, autor del nuevo modelo de pronóstico.
“Si usted tiene más cosas pequeñas surgiendo, usted tiene más oportunidades para que uno de esos crezca en algo grande,” campo agregado.

Afortunadamente, la coctelera del lunes estaba en una falla de tendencia al este y era “demasiado pequeña para asignar a una falla mapeada”, según los sismólogos Lucy Jones.

Ahora, más que nunca, es importante ser proactivo sobre la preparación y la seguridad del terremoto.

Julian De La Torre es un experto en la inspección de la fundación de Los Ángeles, los contratistas de la fundación y la reparación de la fundación. La empresa Julian, Julian Construction, ha inspeccionado más de 15.000 estructuras, trabajando con empresas de ingeniería y departamentos locales de construcción y seguridad. La compañía ha hecho más reparación de la fundación en Los Ángeles que cualquier otra compañía en el área sobre los últimos cinco años.

 

3.6 Earthquake Rattles Los Angeles, Felt from Westwood to San Fernando Valley

los angeles earthquake

Sleepy Angelinos were awakened by a 3.6 earthquake Monday night.

The tremor struck the Westwood area around 11:20 pm, with the epicenter located just west of the Sepulveda Pass of the 405 freeway.

The U.S. Geological Survey categorized the quake as a 4 and 5 intensity, which was predominately felt near Westwood and into the San Fernando Valley, with residents also reporting shaking from Los Feliz, Silver Lake and Glendale.

Luckily, there was no damage reported. In fact, Los Angeles gets earthquakes of this size relatively frequently.

“We get these size earthquakes fairly frequently,” seismologist Zachary Reeves to the Los Angeles Times. “Any severe damage would be pretty unlikely.”

A 2.0 aftershock followed the earthquake.

Earlier this month, it was reported that seismologists are working to release earthquake forecasts for the public. Using data from smaller quakes – similar to Monday’s 3.6 shaker – to predict larger earthquakes to come.

While it was previously believed that smaller temblors relieve stress on major fault lines, seismologist now say the likelihood of a large earthquake rises if moderate seismic activity occurs near a large fault line.

“Big earthquakes can come in clusters. And one can trigger the other,” U.S. Geological Survey seismologist Ned Field, author of the new forecasting model told the Times.

“If you have more little things popping off, you have more opportunities for one of those to grow into something big,” Field added.

Fortunately, Monday’s shaker was on an east-trending fault and was “too small to assign to a mapped fault,” according to seismologists Lucy Jones.

Now, more than ever, it’s important to be proactive about earthquake preparation and safety.

Julian De La Torre is an expert in Los Angeles foundation inspection, foundation contractors and foundation repair. Julian’s company, Julian Construction, has inspected over 15,000 structures, working with engineering firms and local departments of building & safety. The company has done more foundation repair in Los Angeles than any other company in the area over the last five years.

Sismólogos Esperan dar Pronósticos de Terremotos Públicos

earthquake

Mientras que los sismólogos no pueden predecir exactamente cuándo y dónde ocurrirá el próximo gran terremoto, muchos esperan proporcionar al público un servicio de pronóstico sísmico que informaría a las diversas comunidades de California sobre cuándo y dónde es más probable que ocurran las posibilidades de un terremoto mayor.

“Creo que la era del pronóstico del tiempo sísmico está sobre nosotros”, dijo el sismólogo Thomas H. Jordan al diario Los Angeles Times.

“Ahora, no podemos hacer el tipo de predicciones detalladas que los meteorólogos pueden hacer”, explicó. Pero no es que no sepamos nada. Sabemos algo … En mi opinión, usted quiere que el público sepa todo lo que los sismólogos conocen, y básicamente podemos darle un pronóstico sobre una base semanal o diaria “.

Los sismólogos, como Jordan, están presionando por una aplicación que podría actualizar un mapa que muestra diferentes áreas de California que están en mayor riesgo de un terremoto.

De manera similar a los patrones climáticos siguientes, los sismólogos siguen cuando los terremotos más pequeños afectan a puntos sensibles – áreas próximas a una falla mayor (como la falla de San Andreas) – que aumentan las posibilidades de activar fallas mayores.

Por ejemplo, un pequeño terremoto que ocurre junto a la línea de falla de San Andrés en Los Ángeles podría desencadenar un terremoto de magnitud 7 o mayor.

A diferencia de la previsión meteorológica, las previsiones de terremotos tienen mayor margen de error. Según datos recientemente publicados en las Seismological Research Letters, sólo la mitad de los grandes terremotos son precedidos por temblores más pequeños.

La última vez que California experimentó un terremoto de una magnitud 7 o más fue en 1857. Antes de que el terremoto de 7,8 ocurriera, terremotos más pequeños ocurrieron cerca de la punta septentrional de la falla de San Andreas.

Llevando hasta el terremoto masivo, 6.1 y 5.6 terremotos de magnitud lo precedieron. Luego, apenas dos horas más tarde, el terremoto de 7,8 grados golpeó el condado de Monterey y bajó a Los Ángeles en sólo dos minutos.

“Los grandes terremotos pueden venir en racimos. Y uno puede desencadenar el otro “, explicó el sismólogo estadounidense Ned Field.

Aunque anteriormente se creía que los terremotos más pequeños alivian el estrés en la zona, los sismólogos ahora están sugiriendo que los terremotos aumentados en una sola área podrían señalar un “aumento de estrés” que podría predecir un terremoto más grande por venir.

Ahora, más que nunca, es importante ser proactivo sobre la preparación y la seguridad del terremoto.

Julian De La Torre es un experto en la inspección de la fundación de Los Ángeles, los contratistas de la fundación y la reparación de la fundación. La empresa Julian, Julian Construction, ha inspeccionado más de 15.000 estructuras, trabajando con empresas de ingeniería y departamentos locales de construcción y seguridad. La compañía ha hecho más reparación de la fundación en Los Ángeles que cualquier otra compañía en el área sobre los últimos cinco años.

¿Habla español? Echa un vistazo a Julian Construction en español AQUÍ!

Seismologists Hoping to Give Public Earthquake Forecasts

earthquake

While seismologists cannot predict exactly when and where the next major earthquake will occur, many are hoping to provide the public with an earthquake forecast service that would inform California’s various communities of when and where the chances for a major earthquake are more likely to happen.

“I think the age of seismic weather forecasting is upon us,” seismologists Thomas H. Jordan told the Los Angeles Times.

“Now, we can’t make the kind of detailed predictions that meteorologists can make,” he explained. “But it’s not like we know nothing. We know something … In my view, you want the public to know everything the seismologists know, and we can basically give you a forecast on a weekly basis or daily basis.”

Seismologists, like Jordan, are pushing for an app that would be able to update a map that shows different areas of California that are at a higher risk for an earthquake.

Similar to following weather patterns, seismologists follow when smaller earthquakes strike sensitive spots – areas next to a major fault line (like the San Andreas fault) – which increase the chances of activating larger faults.

For example, a small earthquake that occurs next to Los Angeles’ San Andreas fault line could trigger a magnitude 7 or higher earthquake.

Unlike weather forecasting, earthquake forecasts have more room for error. According to data recently published in the Seismological Research Letters, only half of large earthquakes are preceded by smaller tremors.

The last time California experienced an earthquake of a 7 magnitude or higher was back in 1857. Before the 7.8 earthquake erupted, smaller earthquakes occurred near the northern tip of the San Andreas fault.

Leading up to the massive quake, 6.1 and a 5.6 magnitude earthquakes preceded it. Then, just two hours later, the 7.8 quake struck Monterey County and made its way down to Los Angeles in just two minutes.

“Big earthquakes can come in clusters. And one can trigger the other,” U.S. Geological Survey seismologist Ned Field explained.

While it was previously believed that smaller earthquakes relieve pent-up stress in the area, seismologists are now suggesting that increased earthquakes in one single area could signal “increased stress” which would predict a larger earthquake to come.

Now, more than ever, it’s important to be proactive about earthquake preparation and safety.

Julian De La Torre is an expert in Los Angeles foundation inspection, foundation contractors and foundation repair. Julian’s company, Julian Construction, has inspected over 15,000 structures, working with engineering firms and local departments of building & safety. The company has done more foundation repair in Los Angeles than any other company in the area over the last five years.

Strongest Earthquake in 100 Years Strikes Mexico, 32 People Dead

mexico earthquake

An 8.1 earthquake shook Mexico’s southern coast just before midnight on Thursday. The massive quake is the largest earthquake Mexico’s encountered in nearly 100 years.

The seismic activity was felt from Mexico City all the way to Guatemala, leaving 32 people dead.

The United States Geological Survey (USGS) issued a red alert after the earthquake, warning of  human loss and widespread damage.

“High casualties and extensive damage are probable and the disaster is likely widespread. Past red alerts have required a national or international response,” the alert read.

The earthquake likewise triggered a tsunami warning in Mexico, with the National Weather Service Pacific Tsunami Warning predicting waves as tall as 10 feet headed for the coast of Mexico.

Already, 1.85 million homes in the country have lost power and water, which may take up to 48 hours to be restored.

Aftershocks from the quake have added to the devastation, with at least five tremors – measuring above a 5.0 magnitude — already recorded.

As the eastern regions of the United States prepare for Hurricane Irma’s landfall, Los Angeles Mayor, Eric Garcetti, warned Angelinos about the possibility of such an earthquake affecting Southern California.

los angeles

“Friendship means standing together in good times and bad, and the thoughts of all Angelenos are with the people of southern Mexico who are recovering today following last night’s powerful earthquake,” Mayor Garcetti said in a statement about Mexico’s massive earthquake.

Garcetti likewise urged Californians to be proactive about earthquake safety, especially in the wake of such a devastating disaster.

“Californians are well-acquainted with the devastating potential of seismic activity, and the City of Los Angeles is proactively preparing for a disaster that is widely understood to be a matter of ‘when’ and not ‘if,’” his statement continued.

“Angelenos should be informed about what the City is doing to preserve life and property in the event of a major earthquake. Everyone in Los Angeles is encouraged to review the preparedness tips compiled by the Red Cross, and take the necessary steps to prepare their own families and communities — such as storing food and water, and developing readiness plans,” he concluded.

California is currently working on an early earthquake warning system, in addition to Los Angeles’ recent measure requiring the seismic retrofit of all wood-frame, soft story structures.

Recent data showed that the San Andreas fault line is due for a major earthquake, with some seismologists predicting an 8.2 in magnitude.

Since earthquakes started being recorded, a quake has occurred along the San Andreas fault line – near areas like the Grapevine – every 100 years, and it’s been 160 years since the last major earthquake occurred there.

“With 300 miles of fault all going in the same earthquake, you have everybody affected at the same time,” seismologist Lucy Jones told the L.A. Times. “The San Andreas is the one that will produce the earthquake that’s going to cause damage in every city.”

Now, more than ever, it’s important to be proactive about earthquake preparation and safety.

Julian De La Torre is an expert in Los Angeles foundation inspection, foundation contractors and foundation repair. Julian’s company, Julian Construction, has inspected over 15,000 structures, working with engineering firms and local departments of building & safety. The company has done more foundation repair in Los Angeles than any other company in the area over the last five years.

Here’s Why Your Brick Foundation Needs Replacement

brick foundation repair

Brick foundations are very common in Los Angeles.

However, properties that were built before 1910 with a brick foundation, might not have the necessary structural reinforcement needed to survive an earthquake.

Brick foundations that have been constructed without reinforced steel are identified as “unreinforced masonry,” and typically require foundation replacement.

It’s important to identify and remedy any signs of foundation problems early on.

brick foundation replacement los angeles

On the exterior if you’ve noticed any cracks, missing bricks or grout that’s turning to powder, it’s important to get your foundation inspected by a professional foundation contractor.

And on the interior, if you have any doors or windows that stick, your floors slope or are uneven, have hairline fractures in your tile or walls, these could all be signs that your brick foundation is failing.

There are a few repair methods a foundation company can use to fix structural issues with your brick foundation.

First, a foundation specialist will do a detailed assessment of your structure. From there, they’ll suggest which repair option will be the best correction method to fix your foundation.

Most likely, you contractor will recommend installing a sister foundation or doing a completely new foundation.

Like most structures, brick foundations will wear out over time. Wet soil, seismic activity and deterioration of the motor that holds the bricks together, can all lead to degradation and damage to your foundation.

Julian De La Torre is an expert in Los Angeles foundation inspection, foundation contractors and foundation repair. Julian’s company, Julian Construction, has inspected over 15,000 structures, working with engineering firms and local departments of building & safety. The company has done more foundation repair in Los Angeles than any other company in the area over the last five years.

 

Buying a Home? Here’s How to Tell If the Foundation Is Structurally Sound

Purchasing a home is a major investment.

If you’ve been looking at properties that were built before 1930, there’s a chance these buildings may have some foundation issues.

Here are 4 things to be on the look for when shopping for older real estate:

  1. Doors and windows that stick: While this may not sound like a huge issue – let alone a deal breaker – when a property’s doors and windows begin to stick, this could mean there are larger problems with the home’s foundation. Whether the foundation’s structural supports have improper spacing or rotting, both can be expensive to repair and/or replace.
  2. Uneven/sloping floors: While doing your walk-through, if you notice uneven or sloping floors, this should be a big red flag. For starters, this means the home is not level. The underlying causes for this can range from cracks in the property’s foundation to severe damage, rotting or settlement to its supporting structures (like its posts, piers, girders, joists or even its footings).
  3. Cracks in the walls above the building’s doors and windows: If cracks in these areas look like they’re growing in length and/or width, this can also be a sign of foundation damage. It’s important to note how easy it is to mask these types of cracks with simple repairs, so if you see fresh paint or other repairs in these areas, make sure you ask the agent about what work has been done to the home and why.
  4. Foundation cracks: Finally, after you have inspected the home’s interior and exterior, ask to see the basement or crawl space of the structure. If you see any cracks in the walls, be sure to contact a foundation inspector to examine the area. Foundation repair companies, like Julian Construction, can conduct a thorough inspection before you purchase the property.

Julian De La Torre is an expert in Los Angeles foundation inspection, foundation contractors and foundation repair. Julian’s company, Julian Construction, has inspected over 15,000 structures, working with engineering firms and local departments of building & safety. The company has done more foundation repair in Los Angeles than any other company in the area over the last five years.