Earthquake 2 km W Leonessa (RI), Magnitude ML 1.2, 21 August 2023 time 08:15:29 (Timezone UTC)

A magnitude ML 1.2 earthquake occured in region: 2 km W Leonessa (RI), on

21-08-2023 08:15:29 (UTC)
21-08-2023 10:15:29 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.5550, 12.9430 at 13 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

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Display location by

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).

Municipality	Region	Distance (km)	Inhabitants	Cumulative Inhabitants
Leonessa	RI	2	2435	2435
Poggio Bustone	RI	7	2055	4490
Rivodutri	RI	8	1253	5743
Polino	TR	9	233	5976
Morro Reatino	RI	10	373	6349
Cantalice	RI	10	2755	9104
Monteleone di Spoleto	PG	11	599	9703
Labro	RI	12	374	10077
Posta	RI	13	694	10771
Arrone	TR	15	2763	13534
Ferentillo	TR	15	1913	15447
Micigliano	RI	15	127	15574
Colli sul Velino	RI	15	533	16107
Montefranco	TR	15	1276	17383
Borbona	RI	16	617	18000
Poggiodomo	PG	18	117	18117
Rieti	RI	18	47698	65815
Greccio	RI	18	1558	67373
Cittaducale	RI	19	6828	74201
Antrodoco	RI	19	2588	76789
Borgo Velino	RI	19	972	77761
Castel Sant'Angelo	RI	19	1308	79069
Cittareale	RI	19	482	79551
Cascia	PG	19	3217	82768
Scheggino	PG	20	461	83229

Municipalities with at least 50000 inhabitants

An earthquake occurred to

24 Km E of Terni (111501 inhabitants)

44 Km NW of L'Aquila (69753 inhabitants)

49 Km SE of Foligno (57155 inhabitants)

63 Km W of Teramo (54892 inhabitants)

64 Km N of Guidonia Montecelio (88673 inhabitants)

67 Km N of Tivoli (56533 inhabitants)

70 Km E of Viterbo (67173 inhabitants)

76 Km SE of Perugia (166134 inhabitants)

83 Km NE of Roma (2864731 inhabitants)

97 Km N of Velletri (53303 inhabitants)

99 Km W of Montesilvano (53738 inhabitants)

Recent and historical seismicity

Not available maps for this sismic event.

Seismic hazard

Not available maps for this sismic event.

Shakemap

Not available maps for this sismic event.

Felt maps

Not available maps for this sismic event.

Locations history

Type	Magnitude	Date and Time (UTC)	Latitude	Longitude	Depth (km)	Published time (UTC)	Author	Location ID
Reviewed Rev100	ML 1.2	2023-08-21 08:15:29	42.5548	12.9433	13	2023-08-21 08:30:28	Sala Sismica INGV-Roma	120350241

Preferred location and magnitude until now.

Origin information

Origin

Field	Value
Time (UTC)	2023-08-21 08:15:29 ± 0.09
Latitude	42.5548 ± 0.0045
Longitude	12.9433 ± 0.0061
Depth (km)	13 ± 1 (from location)
Evaluation mode of Origin	manual
Evaluation status of Origin	reviewed
Version	100 -> SURVEY-INGV
Event type	earthquake
Origin ID	120350241

Uncertainty

Field	Value
Preferred uncertainty description	uncertainty ellipse
Semi-major axis of confidence ellipse (meter)	567
Semi-minor axis of confidence ellipse (meter)	146
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)	222
Circular confidence region, given by single value of horizontal uncertainty (meter)	570.0
Confidence level of the uncertainty (%)	68

Quality

Field	Value
Largest azimuthal gap in station distribution as seen from epicenter (degree)	178
Number of associated phases, regardless of their use for origin computation	7
Number of defining phases	7
RMS of the travel time residuals of the arrivals used for the origin computation (sec)	0.13
Epicentral distance of station closest to the epicenter (degree)	0.00000
Epicentral distance of station farthest from the epicenter (degree)	0.20505
Number of stations at which the event was observed	4
Number of stations from which data was used for origin computation	4

Magnitude information

ML:1.2

Field	Value
Value	1.2
Uncertainty	0.3
Num. used stations	6
Type of magnitude	ML
Reference to an origin	120350241
Agency	INGV
Autore	Sala Sismica INGV-Roma
Time of creation (UTC)	2023-08-21 08:30:28

Picking and Arrival

SCNL	Time	Uncertainty	Polarity	Evaluation_mode	Phase	Azimuth	Distance(km)	Takeoff_angle	Residual	Weight
IV.RM33.EHZ.	2023-08-21T08:15:38.43	0.3	undecidable	manual	S	103	22.755	101	-0.06	75
IV.GAVE.EHZ.	2023-08-21T08:15:36.55	0.3	undecidable	manual	S	345	15.7731	112	-0.14	74
IV.LNSS.HHZ.	2023-08-21T08:15:35.25	0.3	undecidable	manual	S	56	9.5793	133	-0.05	76
IV.RM33.EHZ.	2023-08-21T08:15:34.86	0.3	undecidable	manual	P	103	22.755	101	-0.01	75
IV.GAVE.EHZ.	2023-08-21T08:15:33.95	0.3	undecidable	manual	P	345	15.7731	112	0.12	74
IV.LNSS.HHZ.	2023-08-21T08:15:33.17	0.3	undecidable	manual	P	56	9.5793	133	0.15	74
IV.ARRO.EHZ.	2023-08-21T08:15:33.64	0.1	positive	manual	P				0.06	1.43

Station Magnitude and Amplitude

SCNL	mag	Generic_amplitude	Period	Type	Category	Unit	Time_window_reference
IV.LNSS.HHE.	ML:1.4	0.000254	0.22	AML	other	m	2023-08-21T08:15:35.43
IV.LNSS.HHN.	ML:1.3	0.000232	0.44	AML	other	m	2023-08-21T08:15:35.47
IV.GAVE.EHN.	ML:1.3	0.000168	0.4	AML	other	m	2023-08-21T08:15:37.03
IV.GAVE.EHE.	ML:1.2	0.0001305	1.58	AML	other	m	2023-08-21T08:15:37.85
IV.RM33.EHN.	ML:0.8	0.0000353	1.06	AML	other	m	2023-08-21T08:15:39.53
IV.RM33.EHE.	ML:0.8	0.0000356	1.4	AML	other	m	2023-08-21T08:15:42.77

TDMT - Time Domain Moment Tensor

Not available TDMT solution for this seismic event.

Fault Plane solutions in the area

Not available maps for this sismic event.

Download

Type	Description	Link
QuakeML - small	Event, Origin, FocalMechanism	Download
QuakeML - full	Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude	Download

Earthquake with magnitude of ML 1.2 on date 21-08-2023 and time 08:15:29 (UTC) in region 2 km W Leonessa (RI)

Municipalities within 20 km from the epicenter

Municipalities with at least 50000 inhabitants

Origin

Uncertainty

Quality

ML:1.2