Scholarlink

<p>Four years after the 2021 Tajogaite eruption on La Palma (Canary Islands), infrastructure including houses and buildings is being affected by creep movements along two active faults: Tazacorte (TZF) and Mazo (MZF). These strike-slip faults, trending NW–SE and ENE-WSW respectively, played a role in guiding the magma ascent during the eruption and continue to influence post-eruptive surface deformation. The faults manifest on the surface as en-echelon faults. Remarkably, these houses had previously undergone repairs since the 1980s due to the same fractures, indicating ongoing fault creep from pre-eruptive stages to post-eruptive stages, where the creep velocity has increased dramatically. This suggests persistent aseismic fault activity that has intensified since the eruption. Although shallow seismic activity occurred during the eruption, the absence of post-eruptive significant instrumental seismicity suggests that the faults have reverted to aseismic creep behaviour. Monitoring of fault creep is now essential, both for understanding ongoing deformation and for informing future land-use planning, as these faults may also to be a seismic risk. Current monitoring with a Novatest FIPSG100 precision fissurometer shows displacement rates ranging from 0.24 to 2.80&#xa0;mm/year along both faults. The study, initially commissioned by the municipality of El Paso, aims to identify the causes of structural damage observed after the eruption. While it does not quantify the number of affected structures, it focuses on selecting buildings that can most effectively reveal ongoing fault movement. Conducted in an emergency context, the methodology has proven useful in delineating active fault zones through surface fracture patterns, though further tools like GNSS should be integrated for comprehensive monitoring.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Emergency intervention for the early estimation of slow creep motion on the active faults of La Palma (Canary Islands, Spain)

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年1月21日

查看全文
  • M. A. Rodríguez-Pascua,
  • M. T. Pedrosa-González,
  • M. A. Perucha,
  • N. Sánchez,
  • L. Sáez-Gabarrón,
  • J. López-Gutiérrez,
  • R. Pérez-López,
  • D. Sanz-Mangas,
  • I. Galindo

摘要

Four years after the 2021 Tajogaite eruption on La Palma (Canary Islands), infrastructure including houses and buildings is being affected by creep movements along two active faults: Tazacorte (TZF) and Mazo (MZF). These strike-slip faults, trending NW–SE and ENE-WSW respectively, played a role in guiding the magma ascent during the eruption and continue to influence post-eruptive surface deformation. The faults manifest on the surface as en-echelon faults. Remarkably, these houses had previously undergone repairs since the 1980s due to the same fractures, indicating ongoing fault creep from pre-eruptive stages to post-eruptive stages, where the creep velocity has increased dramatically. This suggests persistent aseismic fault activity that has intensified since the eruption. Although shallow seismic activity occurred during the eruption, the absence of post-eruptive significant instrumental seismicity suggests that the faults have reverted to aseismic creep behaviour. Monitoring of fault creep is now essential, both for understanding ongoing deformation and for informing future land-use planning, as these faults may also to be a seismic risk. Current monitoring with a Novatest FIPSG100 precision fissurometer shows displacement rates ranging from 0.24 to 2.80 mm/year along both faults. The study, initially commissioned by the municipality of El Paso, aims to identify the causes of structural damage observed after the eruption. While it does not quantify the number of affected structures, it focuses on selecting buildings that can most effectively reveal ongoing fault movement. Conducted in an emergency context, the methodology has proven useful in delineating active fault zones through surface fracture patterns, though further tools like GNSS should be integrated for comprehensive monitoring.