Which risk increases when increased rainfall saturates volcanic tephra deposits on steep slopes?

💡 Explanation

When rainfall saturates tephra, it increases the risk of lahars because the increased weight and pore pressure reduces shear strength, initiating debris flow, therefore lahars are a greater risk rather than lateral blasts or fumarole changes.

• Which phenomenon accelerates when permafrost thaws beneath an Arctic roadbed?
• Which mechanism initiates transverse dune formation against moderate winds?
• Which outcome occurs when the breakdown of the ozone layer maximizes shortwave radiation infiltration to antarctic troposphere within upper tropospheric cells?
• Which mechanism causes increased speleothem formation with increased rainfall?
• Which risk increases when thawing permafrost destabilizes coastal bluffs undergoing wave action?
• Which outcome arises when rapid freshwater influx occurs in a coastal karst aquifer system?