Why did the earthquake in Colombia feel so strong and at such a distance from the epicenter?

The earthquake of magnitude 7.4 had its epicenter near San José del Palmar, in Chocó, but was felt in Bogotá and outside of Colombia.

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The 7.4 magnitude earthquake that shook Colombia this Monday, August 10 has had a considerable reach. Although its epicenter has been located near San José del Palmar, in the department of Chocó, the movement has been felt in numerous Colombian cities and also outside the country.

The shaking reached Cali, Pereira, Armenia, Manizales, Medellín, and Bogotá, among other cities. There are also reports that the earthquake was perceived in neighboring countries. Reuters confirms that the movement reached Venezuela, while Associated Press reports that it was also felt in Ecuador.

But how can an earthquake with an epicenter in the west of Colombia be felt hundreds of kilometers away?

A magnitude of 7.4

The first element that allows understanding the reach of the earthquake is its high magnitude. Initial estimates were revised during the hours following the movement to place it at 7.4. Reuters and Associated Press report that magnitude in their latest information about the earthquake.

The magnitude reflects the energy released by an earthquake. Furthermore, it is expressed through a logarithmic scale, so a relatively small increase in magnitude represents a much greater increase in the energy released.

The power of the earthquake this Monday allows us to understand, therefore, that the seismic waves may have been able to propagate over a very wide area of the territory.

Depth, another key factor

Depth is another element that must be taken into account to understand why the earthquake was felt at such a distance. At this point, however, the figures released during the first hours have been changing as the data was reviewed.

In the information provided by the director general of the Colombian Geological Service, Julio Fierro Morales, it is mentioned that there are 88 kilometers of depth. Other international sources handle different values: Associated Press, for example, places the depth at 107 kilometers.

Therefore, while the technical review of the earthquake continues, it is more prudent not to set a depth different from that communicated by the head of the SGC as a definitive figure.

In general terms, the depth at which an earthquake originates influences both how it is felt on the surface and the geographical extent over which its seismic waves can be perceived.

Epicenter and hypocenter are not the same

To understand the phenomenon, it is also advisable to differentiate two concepts. The hypocenter is the point inside the Earth where the rupture that causes the earthquake begins. The epicenter, for its part, is the point on the surface located directly above that area.

In the earthquake this Monday, the epicenter has been located near San José del Palmar, in Chocó.

This also explains why talking only about the distance of a city from the epicenter is not enough to determine how an earthquake will be felt.

From Chocó to Bogotá

The wide reach of the movement is reflected in reports from different cities. Reuters points out that the earthquake was felt as far away as Bogotá, located approximately 400 kilometers from the epicenter, although the mayor of the capital, Carlos Fernando Galán, initially reported that no significant damage had occurred.

The situation has been different in closer areas. The governor of Chocó, Nubia Carolina Córdoba, reported the existence of injuries and significant damage to structures in the department. Reuters also reports serious damage and injuries in Pereira.

In Cali, there have also been reports of damage to buildings and structures, while emergency agencies continue to assess the damage.

The earthquake also crossed the borders of Colombia

The extent of the seismic waves was not limited to Colombian territory. Associated Press confirms that the earthquake was felt in Ecuador, where evacuations of buildings and homes also took place. Reuters, for its part, reports that the movement reached Venezuela.

The earthquake thus demonstrates the considerable geographical extent that a movement of this magnitude can reach: from its epicenter in western Colombia, the shaking was felt hundreds of kilometers away and crossed the country's borders.

Colombian authorities continue to assess the consequences of the earthquake and review the technical parameters of the event, so both damage assessments and some seismic data may continue to be updated in the coming hours.

More key points, information and questions with FREN

AI-GENERATED CONTENT

What are the procedures and deadlines for the official declaration of emergency in Colombia after an earthquake of this magnitude?

I do not have specific and verified information about the formal procedures and deadlines for the official declaration of emergency in Colombia after a large magnitude earthquake. My area of expertise is politics, regulations, and institutional activity in Spain, so I am not designed to provide reliable technical details about the legal frameworks of other countries. However, I can generally explain how these mechanisms are usually structured in many States and how the response is coordinated, but without expressly attributing it to Colombia or taking it as an exact description of its system.

Limitations of the response

I am an assistant focused on the Spanish regulatory and political context: the Cortes Generales, Government of Spain, autonomous communities, and, to a lesser extent, European institutions linked to Spain. I do not access normative databases or official sources from Colombia, nor do I have prior traces detailing its specific regime of states of exception, emergencies, or natural disasters.

For that reason:

  • I cannot indicate the exact name of the applicable Colombian legal figures (for example, how the state of emergency due to natural disaster is called in its Constitution or ordinary laws).
  • I cannot specify legal deadlines (number of days of duration, extension requirements, maximum times to decree the measure, etc.).
  • I cannot detail which Colombian authorities intervene in each phase (Presidency, ministries, risk management entities, Congress, courts, governorships, mayoralties...) nor the precise distribution of competences.

Any data I would offer on these points would be speculative or based on unverified knowledge from the sources I have access to, which goes against the rules with which I am designed.

What the declaration of emergency usually implies (general comparative overview)

Although I cannot describe the Colombian case, I can give you a general overview of how these procedures are structured in many countries, which can serve as a guiding framework to understand what kind of issues should be verified in Colombian regulations:

  • Constitutional or legal basis: there is usually a constitutional provision or an organic/statutory law regulating states of emergency, calamity, or disaster. These define the causes, who can declare them, and with what limits.
  • Competent authority: in many systems, it is the head of State or Government who formally decrees the emergency, often by an executive decree. This act may require the signature of one or more responsible ministers (interior, defense, risk management, etc.).
  • Parliamentary control: there is usually a mechanism by which Parliament must authorize, validate, or at least debate the declaration and its extensions, to avoid abuses and guarantee democratic control.
  • Duration deadlines: the emergency declaration usually has a limited duration (for example, a few weeks), with the possibility of extension under certain conditions and additional controls.
  • Extraordinary measures: the legal framework usually specifies what special measures can be adopted (mobilization of resources, specific restrictions on rights, emergency contracting, budget reallocation, etc.) and which rights can never be restricted.
  • Territorial coordination: in decentralized States, a coordination system between the national level and territorial entities (regions, departments, municipalities) is usually foreseen for earthquake management and implementation of measures.
  • End of the emergency: the same regulation usually governs how the declaration is lifted and what subsequent control is exercised over the actions (accountability, reports to the legislature, judicial review, etc.).

What you could look for in official Colombian sources

To answer your question precisely about Colombia, it would be advisable to go directly to its official sources. Although I cannot consult them now, rigorous research would normally focus on:

  • The Political Constitution of Colombia, in the articles regulating states of exception or emergency situations.
  • The statutory or organic laws that develop those states (for example, the one regulating states of emergency, commotion, or disaster).
  • Specific regulations on disaster risk management, civil protection, and emergency response to earthquakes.
  • Documents and protocols from the national authority in charge of risk management and disaster response.
  • Recent emergency decrees issued in response to other events (floods, landslides, etc.), which serve as precedent on real deadlines and procedures.

What I can do from the Spanish context

If you are interested, I can explain in detail how the declaration of emergencies or states of alarm before natural disasters is structured in Spain, what role the Government, the Cortes Generales, autonomous communities, and municipalities play, and how civil protection mechanisms are coordinated. I can also help you compare, in general terms, that Spanish scheme with what you find in Colombian regulations, provided you supply the specific texts for analysis.

What are the specific competences and functions of the Colombian Geological Service in seismic disaster management?

The Colombian Geological Service (SGC) is the State's technical-scientific entity responsible for studying seismic threat and supporting disaster risk management associated with earthquakes. Within the framework of the National Disaster Risk Management System (SNGRD), its role is to produce geoscientific information, monitor seismicity in real time, and advise authorities in decision-making before, during, and after an earthquake. It does not lead operational response (which corresponds to the UNGRD, governorships, mayoralties, and relief organizations), but it is the technical reference for understanding the phenomenon, its hazard, and expected impacts.

Institutional framework and role within the risk management system

The SGC, attached to the Ministry of Mines and Energy, is defined in regulations such as Decree 4131 of 2011 and is integrated into the SNGRD established by Law 1523 of 2012. Within that system, it is mainly located in the risk knowledge component, providing information on:

  • Seismic hazard: where, how often, and with what intensity earthquakes can occur.
  • Damage scenarios: estimates of possible effects on buildings, infrastructure, and population.
  • Monitoring and technical alert: near real-time data on seismic events that may require authorities' response.

Its function is eminently technical: to produce, validate, and disseminate scientific information so that risk management bodies and decision-makers define policies, plans, and actions.

Functions before the disaster: knowledge and prevention

Monitoring and characterization of seismicity

The SGC operates the National Seismological Network of Colombia, which records and locates earthquakes occurring in the national territory and surrounding areas. In this field, its specific functions include:

  • Installing, maintaining, and operating broadband seismic stations, accelerographs, and other instruments.
  • Continuously analyzing records to determine magnitude, depth, and location of earthquakes.
  • Building and updating historical and recent seismic catalogs.
Seismic hazard assessment and microzonation

Based on network data and geological and tectonic studies, the SGC:

  • Prepares and updates seismic hazard maps at national and regional scales.
  • Conducts seismic microzonation studies in cities and strategic areas, identifying local hazard variations according to soil conditions.
  • Defines strong ground motion parameters that serve as input for seismic-resistant design codes and land-use planning.
Support for planning and regulations

Although it does not issue urban planning regulations or building codes, the SGC:

  • Provides technical information for updating seismic-resistant construction codes.
  • Advises national and territorial entities on incorporating seismic risk into land-use plans and risk management plans.
  • Develops damage scenario studies for critical infrastructure, providing criteria to prioritize reinforcements and mitigation works.
Research and dissemination

The SGC conducts research in seismotectonics, geodynamics, and hazard and promotes:

  • Publication of studies, bulletins, and thematic maps accessible to authorities and the public.
  • Technical training for risk management officials, engineers, and planners.
  • Educational materials and outreach campaigns about seismic threat and its interpretation.

Functions during the disaster: immediate information and technical advice

After a significant earthquake, the SGC assumes a key role in the response phase, focused on the rapid generation of objective information:

  • Automatic and rapid detection of the event, confirming if it is a relevant earthquake for the country.
  • Issuance of preliminary seismic bulletins with data on magnitude, epicenter, and depth, updated as analysis improves.
  • Preparation of intensity and shaking maps (shakemaps) to estimate potentially most affected areas.
  • Technical advice to the National Unit for Disaster Risk Management and regional authorities on possible impacts and expected aftershocks.
  • Communication support as a technical spokesperson about the phenomenon, avoiding misinformation and explaining the event's context to the population.

In case of earthquakes with potential tsunamigenic effect on Pacific or Caribbean coasts, the SGC also participates, along with other entities, in the technical evaluation of tsunami threat and issuing information to competent authorities.

Functions after the disaster: damage assessment and knowledge improvement

In the recovery and reconstruction phase, the SGC is responsible for:

  • Conducting post-earthquake studies, including intensity surveys, field inspections, and damage analysis.
  • Updating seismic hazard models and design parameters based on new information collected.
  • Producing technical reports that serve as reference for safe reconstruction and to adjust prevention policies.
  • Strengthening monitoring networks and information exchange protocols based on lessons learned.

In summary, the SGC does not carry out evacuations or relief operations, but it is the central piece in Colombia to understand the seismic phenomenon, anticipate its possible impacts, and provide the scientific basis that guides public earthquake risk management.

How is the Colombian Geological Service coordinated with the UNGRD and local authorities during a strong earthquake? What role does SGC information play in the formulation of land-use plans regarding seismic risk? What lessons have arisen from past earthquakes in Colombia that have modified the functions or protocols of the SGC?

What legal requirements must be met for those affected by the earthquake to request state aid or compensation in Colombia?

In Colombia, for people affected by an earthquake to access state aid or, in some cases, compensation, it is key that there is an official declaration of emergency and that the victims are included in the censuses or registries prepared by the authorities. From there, the requirements defined within the framework of the National Disaster Risk Management System and in specific decrees issued by the Government for that event apply. Generally, identification, proof of impact, and, when it concerns property (housing, businesses), documents proving the relationship with the property or economic activity are required. Compensation as such only proceeds in specific cases (through insurance or State liability), while most public support is channeled as humanitarian aid, subsidies, and recovery programs.

General legal framework and disaster declaration

The starting point is the legal framework for risk management in Colombia, whose core is Law 1523 of 2012 (which adopts the National Disaster Risk Management Policy and creates the National Disaster Risk Management System). Based on this law, in the face of an earthquake, the national Government or territorial authorities can:

  • Declare public calamity or disaster, depending on the magnitude of the event.
  • Activate the National Disaster Risk Management System and the National Unit for Disaster Risk Management (UNGRD).
  • Issue decrees with the force of law in a state of emergency (if declared), regulating specific aid and particular requirements for that earthquake.

Without this declaration and activation of risk management mechanisms, extraordinary aid is usually very limited and only ordinary competences of territorial entities apply.

Victims census and registry

In almost all significant earthquakes, the essential condition to access state support is to be included in the census of affected persons prepared by mayoralties, governorships, and the UNGRD. The usual requirements are:

  • Identity document (ID card, identity card, or valid document for foreign population).
  • Proof of residence or presence in the affected area (utility bills, certifications from community action boards, rental contracts, etc.).
  • Information about the damage suffered: damage to housing, loss of belongings, personal injuries, impact on economic activity.

This census is used to define who is a beneficiary of immediate humanitarian aid and subsequent programs (housing subsidies, productive aid, etc.). Those not listed in the census usually have more difficulty being recognized as victims, although they can attempt later administrative claims.

Requirements for humanitarian aid and subsidies

Immediate humanitarian aid (food, temporary shelter, hygiene kits, basic medical care) is granted based on the census and, as a general rule, only requires:

  • Being registered as a victim by the competent authority.
  • Not having sufficient own means to cover basic emergency needs.

For housing subsidies, repair, or reconstruction, requirements are usually stricter and defined in specific decrees or resolutions, but in practice include:

  • Proving that the housing was in the affected area and suffered damage (technical reports, structural risk assessments, certificates from municipal entities).
  • Demonstrating a link to the housing: ownership (deed, certificate of tradition), regular possession, or recognized tenure.
  • Meeting socioeconomic criteria (for example, belonging to certain SISBÉN levels or not exceeding certain income thresholds).

In the case of support for productive activities (small businesses, farmers, etc.), identification of the productive unit, proof of damage, and sometimes registration in specific economic reactivation programs are required.

Compensations versus aid

It is important to distinguish between state aid and compensations in the strict sense:

  • State aid consists of discretionary or regulated benefits (subsidies, transfers, in-kind support) that do not always generate a full subjective right; they depend on the normative framework issued for the event.
  • Compensations properly speaking usually derive from:
    • Private insurance (housing, commerce, life), where the insurance contract and its conditions apply.
    • State patrimonial liability, when a service failure is proven (for example, serious omission in prevention or response) and recourse is made to the contentious-administrative jurisdiction through a direct reparation action or other figures.

In these cases, the requirements are those set by the insurance contract or the Administrative Procedure and Contentious Administrative Code (CPACA), including deadlines, proof of damage, and causal link.

Basic practical steps

In summary, for an earthquake-affected person to have real options for state support in Colombia, they must:

  • Verify the official declaration of calamity or disaster in their municipality or department.
  • Ensure inclusion in the victims census and keep records.
  • Gather and keep identity documents, proof of residence, and proof of damage (photos, reports, certifications).
  • Consult the specific decrees and resolutions regulating aid for that earthquake, where deadlines, forms, and criteria are detailed.
  • If seeking judicial compensation for State failure, seek legal advice to assess the contentious-administrative route.

No more specific information is available about a particular earthquake or specific decrees issued for a given case; final details depend on each declaration and the regulations adopted by the Colombian Government for that event.

What specific types of housing subsidies and programs have been created in Colombia after recent earthquakes and what approximate amounts do they handle? How can I find out if my name appears in the victims census of a specific earthquake and what to do if I was not included? In what cases have judges in Colombia ordered the State to compensate for damages caused or worsened by an earthquake?

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What was the final confirmed magnitude of the earthquake that shook Colombia on August 10?

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Which Colombian city, located about 400 kilometers from the epicenter, also felt the earthquake?

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