Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 26-09-2023 and time 22:08:47 (UTC) in region 8 km NW Accumoli (RI)

A magnitude ML 1.2 earthquake occured in region: 8 km NW Accumoli (RI), on

  • 26-09-2023 22:08:47 (UTC)
  • 27-09-2023 00:08:47 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7330, 13.1610 at 11 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
Accumoli RI 8 667 667
Norcia PG 9 4957 5624
Arquata del Tronto AP 12 1178 6802
Cascia PG 12 3217 10019
Cittareale RI 13 482 10501
Amatrice RI 16 2657 13158
Castelsantangelo sul Nera MC 18 281 13439
Poggiodomo PG 19 117 13556
Montegallo AP 19 523 14079
Preci PG 19 724 14803
Monteleone di Spoleto PG 19 599 15402

Municipalities with at least 50000 inhabitants

An earthquake occurred to
45 Km SE of Foligno (57155 inhabitants)
45 Km W of Teramo (54892 inhabitants)
46 Km E of Terni (111501 inhabitants)
47 Km NW of L'Aquila (69753 inhabitants)
75 Km SE of Perugia (166134 inhabitants)
85 Km W of Montesilvano (53738 inhabitants)
89 Km NE of Guidonia Montecelio (88673 inhabitants)
91 Km NE of Tivoli (56533 inhabitants)
91 Km W of Pescara (121014 inhabitants)
93 Km W of Chieti (51815 inhabitants)
93 Km E of Viterbo (67173 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 1.2 2023-09-26
22:08:47		 42.733 13.1608 11 2023-09-26
22:14:29		 Sala Sismica INGV-Roma 121497741
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-26 22:08:47 ± 0.09
Latitude 42.7330 ± 0.0036
Longitude 13.1608 ± 0.0073
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121497741

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 526
Semi-minor axis of confidence ellipse (meter) 297
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 279
Circular confidence region, given by single value of horizontal uncertainty (meter) 530.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 93
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0.10612
Epicentral distance of station farthest from the epicenter (degree) 0.35973
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
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 121497741
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-26 22:14:29
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FDMO.HHZ. 2023-09-26T22:08:59.53 0.6 undecidable manual S 350 34.2435 50 0.01 48
IV.GAVE.EHN. 2023-09-26T22:08:56.99 0.3 undecidable manual S 258 22.1556 50 0.67 66
IV.MC2.EHZ. 2023-09-26T22:08:56.17 0.3 undecidable manual S 7 19.9689 50 0.46 68
IV.MMO1.EHZ. 2023-09-26T22:08:56.67 0.6 undecidable manual S 36 22.8549 50 0.18 50
IV.RM33.EHZ. 2023-09-26T22:08:56.91 0.3 undecidable manual S 170 25.2525 50 -0.22 69
IV.SMA1.EHZ. 2023-09-26T22:08:55.66 0.3 undecidable manual S 129 18.1707 50 0.41 69
IV.CSP1.EHZ. 2023-09-26T22:08:55.68 0.3 undecidable manual P 5 39.9267 50 0.17 73
IV.LNSS.HHZ. 2023-09-26T22:08:54.89 0.3 undecidable manual S 214 17.4714 50 -0.16 76
IV.FDMO.HHZ. 2023-09-26T22:08:54.67 0.3 undecidable manual P 350 34.2435 50 0.05 74
IV.RM33.EHZ. 2023-09-26T22:08:53.24 0.6 positive manual P 170 25.2525 50 0 49
IV.GAVE.EHN. 2023-09-26T22:08:53.04 0.3 undecidable manual P 258 22.1556 50 0.27 73
IV.NRCA.HHZ. 2023-09-26T22:08:53.08 0.6 undecidable manual S 341 11.7771 133 -0.46 49
IV.MMO1.EHZ. 2023-09-26T22:08:52.86 0.6 negative manual P 36 22.8549 50 -0.02 50
IV.MC2.EHZ. 2023-09-26T22:08:52.46 0.3 undecidable manual P 7 19.9689 50 0.04 75
IV.SMA1.EHZ. 2023-09-26T22:08:52.19 0.3 undecidable manual P 129 18.1707 50 0.03 76
IV.LNSS.HHZ. 2023-09-26T22:08:51.86 0.6 positive manual P 214 17.4714 50 -0.18 50
IV.NRCA.HHZ. 2023-09-26T22:08:50.87 0.1 undecidable manual P 341 11.7771 133 -0.3 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.5 0.00033850000000000004 0.12 AML other m 2023-09-26T22:08:53.51
IV.NRCA.HHE. ML:1.7 0.0005055 0.14 AML other m 2023-09-26T22:08:53.59
IV.SMA1.EHN. ML:1.2 0.0001225 0.56 AML other m 2023-09-26T22:08:56.71
IV.LNSS.HHE. ML:0.9 0.00005965 1.16 AML other m 2023-09-26T22:08:56.87
IV.SMA1.EHE. ML:1.3 0.00015300000000000003 0.4 AML other m 2023-09-26T22:08:57.64
IV.LNSS.HHN. ML:0.8 0.000047850000000000004 0.6 AML other m 2023-09-26T22:08:57.49
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