Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 21-09-2023 and time 06:56:17 (UTC) in region 2 km SW Cittareale (RI)

A magnitude ML 1.9 earthquake occured in region: 2 km SW Cittareale (RI), on

  • 21-09-2023 06:56:17 (UTC)
  • 21-09-2023 08:56:17 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6000, 13.1480 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.

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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 9 694 1176
Borbona RI 10 617 1793
Montereale AQ 12 2581 4374
Amatrice RI 12 2657 7031
Accumoli RI 14 667 7698
Capitignano AQ 15 665 8363
Leonessa RI 16 2435 10798
Cagnano Amiterno AQ 17 1369 12167
Monteleone di Spoleto PG 17 599 12766
Cascia PG 17 3217 15983
Micigliano RI 18 127 16110
Campotosto AQ 19 542 16652
Barete AQ 20 737 17389

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km NW of L'Aquila (69753 inhabitants)
41 Km E of Terni (111501 inhabitants)
46 Km W of Teramo (54892 inhabitants)
54 Km SE of Foligno (57155 inhabitants)
75 Km NE of Guidonia Montecelio (88673 inhabitants)
76 Km NE of Tivoli (56533 inhabitants)
83 Km W of Montesilvano (53738 inhabitants)
84 Km SE of Perugia (166134 inhabitants)
88 Km E of Viterbo (67173 inhabitants)
88 Km W of Chieti (51815 inhabitants)
89 Km W of Pescara (121014 inhabitants)
96 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 1.9 2023-09-21
06:56:17		 42.5998 13.1483 12 2023-09-21
07:09:45		 Sala Sismica INGV-Roma 121301331
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-21 06:56:17 ± 0.08
Latitude 42.5998 ± 0.0045
Longitude 13.1483 ± 0.0061
Depth (km) 12 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121301331

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 478
Semi-minor axis of confidence ellipse (meter) 374
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 61
Circular confidence region, given by single value of horizontal uncertainty (meter) 480.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 88
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 27
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0.07914
Epicentral distance of station farthest from the epicenter (degree) 0.57017
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 15
Magnitude information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 32
Type of magnitude ML
Reference to an origin 121301331
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-21 07:09:45
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MML1.EHZ. 2023-09-21T06:56:36.02 0.3 undecidable manual S 346 58.7967 91 0.46 64
IV.ASSB.HHZ. 2023-09-21T06:56:36.87 0.6 undecidable manual S 321 63.2922 90 0.11 45
IV.CSP1.EHZ. 2023-09-21T06:56:34.89 0.6 undecidable manual S 5 54.8007 91 0.4 44
IV.FDMO.HHZ. 2023-09-21T06:56:32.65 0.6 undecidable manual S 354 48.7179 91 -0.22 45
IV.FIAM.HHZ. 2023-09-21T06:56:29.81 0.6 undecidable manual S 184 36.9297 91 0.09 47
IV.ASSB.HHZ. 2023-09-21T06:56:29.10 0.1 undecidable manual P 321 63.2922 90 0.52 82
IV.GIGS.HHZ. 2023-09-21T06:56:29.90 0.6 undecidable manual S 115 38.3283 91 -0.2 45
IV.MML1.EHZ. 2023-09-21T06:56:28.04 1.0 undecidable manual P 346 58.7967 91 0.15 23
IV.CSP1.EHZ. 2023-09-21T06:56:27.13 0.6 negative manual P 5 54.8007 91 -0.15 45
IV.FDMO.HHZ. 2023-09-21T06:56:26.08 0.6 negative manual P 354 48.7179 91 -0.26 44
IV.MTRA.HNZ. 2023-09-21T06:56:26.68 0.6 undecidable manual S 49 26.6511 92 -0.32 45
IV.MF5.EHZ. 2023-09-21T06:56:26.94 0.3 positive manual P 30 49.9167 91 0.41 66
IV.NRCA.HHZ. 2023-09-21T06:56:26.33 0.6 undecidable manual S 354 26.0517 92 -0.51 43
IV.GAVE.EHZ. 2023-09-21T06:56:25.50 0.6 undecidable manual S 296 23.1546 92 -0.55 44
IV.GIGS.HHZ. 2023-09-21T06:56:24.76 1.0 undecidable manual P 115 38.3283 91 0.02 24
IV.TERO.HHZ. 2023-09-21T06:56:24.38 1.0 undecidable manual P 86 37.2294 91 -0.2 23
IV.SMA1.EHZ. 2023-09-21T06:56:24.30 0.6 undecidable manual S 77 15.6732 99 0.25 49
IV.FIAM.HHZ. 2023-09-21T06:56:24.56 0.3 negative manual P 184 36.9297 91 0.04 72
IV.RM33.EHZ. 2023-09-21T06:56:23.03 0.6 undecidable manual S 152 11.4774 116 0.04 50
IV.MTRA.HNZ. 2023-09-21T06:56:22.72 0.1 undecidable manual P 49 26.6511 92 -0.23 92
IV.LNSS.HHZ. 2023-09-21T06:56:22.09 0.6 undecidable manual S 272 8.7801 129 -0.31 48
IV.NRCA.HHZ. 2023-09-21T06:56:22.59 0.6 undecidable manual P 354 26.0517 92 -0.27 46
IV.GAVE.EHZ. 2023-09-21T06:56:22.16 0.1 positive manual P 296 23.1546 92 -0.24 94
IV.CAMP.HHZ. 2023-09-21T06:56:22.33 0.3 undecidable manual P 108 22.4553 92 0.03 74
IV.SMA1.EHZ. 2023-09-21T06:56:21.49 0.1 positive manual P 77 15.6732 99 0.24 97
IV.LNSS.HHZ. 2023-09-21T06:56:20.21 0.1 undecidable manual P 272 8.7801 129 -0.08 100
IV.RM33.EHZ. 2023-09-21T06:56:20.79 0.1 positive manual P 152 11.4774 116 0.16 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LNSS.HNE. ML:2.8 0.007255 0.16 AML other m 2023-09-21T06:56:22.21
IV.LNSS.HHE. ML:2.8 0.007645 0.14 AML other m 2023-09-21T06:56:22.28
IV.LNSS.HNN. ML:2.5 0.0036449999999999994 0.24 AML other m 2023-09-21T06:56:22.34
IV.LNSS.HHN. ML:2.5 0.004285 0.22 AML other m 2023-09-21T06:56:22.33
IV.RM33.HNN. ML:1.7 0.0006065 0.76 AML other m 2023-09-21T06:56:23.25
IV.RM33.EHN. ML:1.7 0.00059 0.74 AML other m 2023-09-21T06:56:23.26
IV.RM33.EHE. ML:1.7 0.0004915000000000001 0.4 AML other m 2023-09-21T06:56:23.66
IV.RM33.HNE. ML:1.7 0.0005385 0.96 AML other m 2023-09-21T06:56:24.66
IV.SMA1.EHN. ML:2.1 0.0011749999999999998 0.3 AML other m 2023-09-21T06:56:24.68
IV.SMA1.EHE. ML:2.1 0.001173 0.38 AML other m 2023-09-21T06:56:24.68
IV.GAVE.EHN. ML:2.2 0.00108 0.24 AML other m 2023-09-21T06:56:25.77
IV.GAVE.HNE. ML:2.4 0.0016549999999999998 0.16 AML other m 2023-09-21T06:56:25.83
IV.GAVE.EHE. ML:2.4 0.0016200000000000001 0.16 AML other m 2023-09-21T06:56:25.84
IV.GAVE.HNN. ML:1.9 0.0004895 1.4 AML other m 2023-09-21T06:56:26.06
IV.CAMP.HHE. ML:1.3 0.0001225 0.62 AML other m 2023-09-21T06:56:26.43
IV.NRCA.HHE. ML:2.2 0.0008494999999999999 0.58 AML other m 2023-09-21T06:56:26.43
IV.NRCA.HNE. ML:2.1 0.0007755 0.58 AML other m 2023-09-21T06:56:26.43
IV.CAMP.HHN. ML:1.4 0.000148 1.68 AML other m 2023-09-21T06:56:27.08
IV.NRCA.HHN. ML:1.9 0.0004485 0.14 AML other m 2023-09-21T06:56:27.28
IV.NRCA.HNN. ML:1.9 0.00046599999999999994 0.98 AML other m 2023-09-21T06:56:27.21
IV.TERO.HHE. ML:1.7 0.0001785 0.12 AML other m 2023-09-21T06:56:29.94
IV.FIAM.HHN. ML:1.6 0.0001495 0.18 AML other m 2023-09-21T06:56:30.25
IV.TERO.HHN. ML:1.8 0.0002095 0.16 AML other m 2023-09-21T06:56:30.52
IV.FIAM.HHE. ML:1.8 0.00020899999999999998 1.46 AML other m 2023-09-21T06:56:30.99
IV.FDMO.HHN. ML:1.6 0.0000955 0.26 AML other m 2023-09-21T06:56:33.45
IV.FDMO.HHE. ML:1.6 0.00012054999999999999 0.2 AML other m 2023-09-21T06:56:33.74
IV.CSP1.EHN. ML:2.1 0.0002855 0.98 AML other m 2023-09-21T06:56:36.65
IV.CSP1.EHE. ML:1.9 0.0001875 1.36 AML other m 2023-09-21T06:56:36.75
IV.MML1.EHN. ML:1.5 0.0000656 1.78 AML other m 2023-09-21T06:56:36.06
IV.ASSB.HHN. ML:1.5 0.0000532 0.42 AML other m 2023-09-21T06:56:38.33
IV.ASSB.HHE. ML:1.4 0.00004865 0.24 AML other m 2023-09-21T06:56:39.92
IV.MML1.EHE. ML:1.4 0.000057300000000000004 0.78 AML other m 2023-09-21T06:56:42.63
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