emergency alert system u201c eas_event_code u201d can indicates a type of an eas and can represent a type of an emergency such as a flood a terror an earthquake and the like together with detailed information of the emergency such as a large scale earthquake a medium scale earthquake a small scale earthquake and the like for example u201c nature_of_activation_text_length u201d can indicate a length of u201c nature_of_activation_text u201d for instance if a u201c nature_of_activation_text_length u201d field value is u2018 0 u2019 it can mean that u201c nature_of_activation_text u201d is not included in a present emergency alert message u201c nature_of_activation_text u201d can include a specific syntax representing a textual representation of an event code displayed on a screen u201c alert_message_time_remaining u201d can indicate a remaining output time of an emergency alert message for instance u201c alert_message_time_remaining u201d can be set to a unit of 0 u02dc 120 seconds a zero value may represent an infinite duration and the u201c alert_message_time_remaining u201d field can indicate a duration time which should continue from a time point of rendering an emergency alert message into an interrupt service to a returning time point of the emergency alert by a unit of seconds u201c event_start_time u201d can represent a start time of an eam event by a unit of seconds after 00 hours utc jan 6 1980 if the field is a past time by being compared to an stt time of a.