Moderate earthquake, 5.1 mag was detected near Semnan in Iran

A moderate earthquake magnitude 5.1 (ml/mb) has struck on Friday, 36 kilometers (22 miles) from Semnan in Iran. All ids that are associated to the event: us6000qlhj. Unique identifier: us6000qlhj. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Global date and time of event UTC/GMT: 20/06/25 / 2025-06-20 17:49:14 / June 20, 2025 @ 5:49 pm. The earthquake occurred at a depth of 10 km (6 miles). Exact location of event, longitude 53.0699 East, latitude 35.3758 North, depth = 10 km. The 5.1-magnitude earthquake was detected at 17:49:14 / 5:49 pm (local time epicenter).

Earthquake epicenter was 37 km (23 miles) from Semnān (c. 124 800 pop), 71 km (44 miles) from Īstgāh-e Rāh Āhan-e Garmsār (c. 49 500 pop), 98 km (61 miles) from Damāvand (c. 29 100 pop), 45 km (28 miles) from Mahdishahr (c. 21 000 pop). Nearest cities/city/villages to epicentrum/hypocenter was Damāvand, Īstgāh-e Rāh Āhan-e Garmsār, Mahdishahr (min 5000 pop). Close country/countries that might be effected, Iran (c. 76 923 000 pop).

There are an estimated 1320 moderate quakes in the world each year. Earthquakes 5.0 to 6.0 may cause light damage to buildings and other structures. In the past 24 hours, there have been one, in the last 10 days one, in the past 30 days one and in the last 365 days four earthquakes of magnitude 3.0 or greater that have been detected nearby.

Questions or comments?

How did you react? Was there any damage to buildings? Leave a comment or report about shaking, activity and damage at your home, city and country. Read more about the earthquake, Distances, Seismometer information, Date-Time, Parameters, Location and details about this quake, that has struck: 36 km SW of Semnan, Iran. This data comes from the USGS Earthquake Notification Service.

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Parameter	Value	Description
Magnitude	5.1 mb	The magnitude for the event.
Longitude	53.0699° East	Decimal degrees longitude. Negative values for western longitudes.
Latitude	35.3758° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	10 km	Depth of the event in kilometers.
Place	36 km SW of Semnan, Iran	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2025-06-20 17:49:14	Time when the event occurred. UTC/GMT
Updated	2025-06-20 18:07:17	Time when the event was most recently updated. UTC/GMT
Timezone offset		Timezone offset from UTC in minutes at the event epicenter.
Felt		The total number of felt reports
CDI		The maximum reported intensity for the event.
MMI		The maximum estimated instrumental intensity for the event.
Alert Level		The alert level from the PAGER earthquake impact scale. Green, Yellow, Orange or Red.
Review Status	reviewed	Indicates whether the event has been reviewed by a human.
Tsunami	0	This flag is set to "1" for large events in oceanic regions and "0" otherwise. The existence or value of this flag does not indicate if a tsunami actually did or will exist.
SIG	400	A number describing how significant the event is. Larger numbers indicate a more significant event.
Network	us	The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources	,us,	A comma-separated list of network contributors.
Number of Stations Used	93	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	5.004	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.98 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	81	The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type	mb	The method or algorithm used to calculate the preferred magnitude for the event.
Event Type	earthquake	Type of seismic event.
Event ID	us6000qlhj	Id of event.
Event Code	6000qlhj	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,us6000qlhj,	A comma-separated list of event ids that are associated to an event.

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Moderate earthquake, 5.1 mag was detected near Semnan in Iran

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