Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 21-09-2023 and time 07:28:48 (UTC) in region 2 km W Cittareale (RI)

A magnitude ML 1.1 earthquake occured in region: 2 km W Cittareale (RI), on

  • 21-09-2023 07:28:48 (UTC)
  • 21-09-2023 09:28:48 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6150, 13.1360 at 12 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Cittareale RI 2 482 482
Posta RI 11 694 1176
Borbona RI 11 617 1793
Amatrice RI 13 2657 4450
Accumoli RI 13 667 5117
Montereale AQ 14 2581 7698
Leonessa RI 15 2435 10133
Cascia PG 15 3217 13350
Monteleone di Spoleto PG 16 599 13949
Capitignano AQ 17 665 14614
Cagnano Amiterno AQ 19 1369 15983
Micigliano RI 19 127 16110
Poggiodomo PG 20 117 16227

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km NW of L'Aquila (69753 inhabitants)
40 Km E of Terni (111501 inhabitants)
47 Km W of Teramo (54892 inhabitants)
52 Km SE of Foligno (57155 inhabitants)
76 Km NE of Guidonia Montecelio (88673 inhabitants)
78 Km NE of Tivoli (56533 inhabitants)
82 Km SE of Perugia (166134 inhabitants)
84 Km W of Montesilvano (53738 inhabitants)
87 Km E of Viterbo (67173 inhabitants)
90 Km W of Chieti (51815 inhabitants)
90 Km W of Pescara (121014 inhabitants)
97 Km NE of Roma (2864731 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.1 2023-09-21
07:28:48		 42.6152 13.1362 12 2023-09-21
07:39:40		 Sala Sismica INGV-Roma 121302741
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-21 07:28:48 ± 0.21
Latitude 42.6152 ± 0.0153
Longitude 13.1362 ± 0.0098
Depth (km) 12 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121302741

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1330
Semi-minor axis of confidence ellipse (meter) 1100
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 196
Circular confidence region, given by single value of horizontal uncertainty (meter) 1330.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 109
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.34444
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 121302741
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-21 07:39:40
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ATVO.HHZ. 2023-09-21T07:29:03.17 3.0 undecidable manual Pg -0.05 0
IV.TERO.HHZ. 2023-09-21T07:29:01.38 0.6 undecidable manual S 89 38.2284 93 -0.09 49
IV.GAVE.EHZ. 2023-09-21T07:28:57.02 0.6 undecidable manual S 294 21.5673 98 -0.02 51
IV.TERO.HHZ. 2023-09-21T07:28:56.09 0.6 undecidable manual P 89 38.2284 93 -0.03 50
IV.SMA1.EHZ. 2023-09-21T07:28:55.82 0.6 undecidable manual S 84 16.3725 106 0.14 51
IV.RM33.EHZ. 2023-09-21T07:28:54.38 0.6 undecidable manual S 151 13.3755 115 -0.57 47
7F.SIB2.EHE. 2023-09-21T07:28:54.88 0.1 undecidable manual P 24 33.5442 93 -0.52 90
IV.SMA1.EHZ. 2023-09-21T07:28:53.11 0.1 positive manual P 84 16.3725 106 0.33 97
IV.LNSS.HHZ. 2023-09-21T07:28:53.65 0.6 undecidable manual S 260 7.9809 137 -0.12 53
IV.GAVE.EHZ. 2023-09-21T07:28:53.79 0.1 undecidable manual P 294 21.5673 98 0.23 97
IV.RM33.EHZ. 2023-09-21T07:28:52.43 0.6 positive manual P 151 13.3755 115 0.08 51
IV.LNSS.HHZ. 2023-09-21T07:28:51.85 0.1 negative manual P 260 7.9809 137 0.17 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LNSS.HHE. ML:1.5 0.00040800000000000005 0.16 AML other m 2023-09-21T07:28:53.87
IV.LNSS.HNE. ML:1.5 0.0003805 0.16 AML other m 2023-09-21T07:28:53.87
IV.LNSS.HHN. ML:1.3 0.000249 0.22 AML other m 2023-09-21T07:28:53.80
IV.LNSS.HNN. ML:1.2 0.00019893155 0.2048 AML other m 2023-09-21T07:28:53.80
IV.SMA1.EHN. ML:0.8 0.00005595 0.34 AML other m 2023-09-21T07:28:56.13
IV.SMA1.EHE. ML:0.8 0.00004807726 0.2816 AML other m 2023-09-21T07:28:57.35
IV.RM33.EHE. ML:0.5 0.00002970275 0.2432 AML other m 2023-09-21T07:28:56.42
IV.RM33.EHN. ML:0.7 0.0000496491 0.1792 AML other m 2023-09-21T07:28:55.05
IV.RM33.HNE. ML:1.1 0.000111088565 0.7232 AML other m 2023-09-21T07:28:53.77
IV.RM33.HNN. ML:1.1 0.00012823204999999998 0.6528 AML other m 2023-09-21T07:28:58.72
IV.TERO.HHE. ML:0.4 0.0000123865975 0.0576 AML other m 2023-09-21T07:29:02.45
IV.TERO.HHN. ML:0.8 0.00001771195 0.8384 AML other m 2023-09-21T07:29:15.66
IV.TERO.HNE. ML:1.4 0.000077815965 0.7552 AML other m 2023-09-21T07:29:10.96
IV.TERO.HNN. ML:1.4 0.00008290931 0.8576 AML other m 2023-09-21T07:29:15.68
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download