Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 12-08-2023 and time 01:26:05 (Italy) in region 6 km W Accumoli (RI)

A magnitude ML 0.9 earthquake occured in region: 6 km W Accumoli (RI), on

  • 11-08-2023 23:26:05 (UTC)
  • 12-08-2023 01:26:05 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7010, 13.1780 at 8 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 6 667 667
Cittareale RI 9 482 1149
Amatrice RI 12 2657 3806
Norcia PG 12 4957 8763
Arquata del Tronto AP 13 1178 9941
Cascia PG 14 3217 13158
Monteleone di Spoleto PG 19 599 13757
Poggiodomo PG 20 117 13874

Municipalities with at least 50000 inhabitants

An earthquake occurred to
43 Km NW of L'Aquila (69753 inhabitants)
43 Km W of Teramo (54892 inhabitants)
46 Km E of Terni (111501 inhabitants)
48 Km SE of Foligno (57155 inhabitants)
79 Km SE of Perugia (166134 inhabitants)
82 Km W of Montesilvano (53738 inhabitants)
86 Km NE of Guidonia Montecelio (88673 inhabitants)
88 Km NE of Tivoli (56533 inhabitants)
89 Km W of Pescara (121014 inhabitants)
90 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 0.9 2023-08-11
23:26:05		 42.7013 13.1778 8 2023-08-11
23:31:10		 Sala Sismica INGV-Roma 120040521
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-08-11 23:26:05 ± 0.06
Latitude 42.7013 ± 0.0027
Longitude 13.1778 ± 0.0049
Depth (km) 8 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 120040521

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 319
Semi-minor axis of confidence ellipse (meter) 245
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 282
Circular confidence region, given by single value of horizontal uncertainty (meter) 320.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 75
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.11
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.45775
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 7
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 120040521
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-08-11 23:31:10
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CRE.HHZ. 2023-08-11T23:26:46.15 3.0 undecidable manual S -0.16 0
IV.MOMA.HHZ. 2023-08-11T23:26:22.26 0.6 undecidable manual S 283 50.8158 50 0.13 92
IV.ASSB.HHZ. 2023-08-11T23:26:15.83 3.0 undecidable manual P 0.37 0
IV.MOMA.HHZ. 2023-08-11T23:26:15.15 1.0 undecidable manual P 283 50.8158 50 0.05 47
IV.MMO1.EHZ. 2023-08-11T23:26:14.85 0.6 undecidable manual S 29 25.0527 108 0.17 95
IV.CSP1.EHZ. 2023-08-11T23:26:13.74 3.0 positive manual P 0.28 0
IV.RM33.EHZ. 2023-08-11T23:26:13.62 0.6 undecidable manual S 172 21.5673 111 0.09 98
IV.GIGS.HHZ. 2023-08-11T23:26:13.58 1.0 undecidable manual P 130 42.4242 50 -0.23 46
IV.FDMO.HHZ. 2023-08-11T23:26:12.57 3.0 positive manual P 0.1 0
IV.TERO.HHZ. 2023-08-11T23:26:12.40 1.0 undecidable manual P 104 35.8419 50 -0.39 45
IV.NRCA.HHZ. 2023-08-11T23:26:11.44 0.6 undecidable manual S 341 15.5733 118 -0.2 96
IV.LNSS.HHZ. 2023-08-11T23:26:11.58 0.6 undecidable manual S 226 15.6732 118 -0.09 98
IV.MMO1.EHZ. 2023-08-11T23:26:10.90 0.6 positive manual P 29 25.0527 108 0.09 97
IV.RM33.EHZ. 2023-08-11T23:26:10.28 1.0 undecidable manual P 172 21.5673 111 0.14 48
IV.NRCA.HHZ. 2023-08-11T23:26:09.03 0.6 undecidable manual P 341 15.5733 118 -0.02 100
IV.LNSS.HHZ. 2023-08-11T23:26:09.18 1.0 undecidable manual P 226 15.6732 118 0.11 49
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LNSS.HHN. ML:1.3 0.00020050000000000002 0.2 AML other m 2023-08-11T23:26:11.79
IV.NRCA.HHN. ML:1.6 0.0003725 0.92 AML other m 2023-08-11T23:26:12.60
IV.NRCA.HHE. ML:1.6 0.000358 0.1 AML other m 2023-08-11T23:26:12.14
IV.LNSS.HHE. ML:1.1 0.0001365 0.68 AML other m 2023-08-11T23:26:12.34
IV.MMO1.EHE. ML:0.8 0.0000374 1.22 AML other m 2023-08-11T23:26:15.37
IV.MMO1.EHN. ML:0.7 0.000028250000000000002 0.48 AML other m 2023-08-11T23:26:15.43
IV.FDMO.HHN. ML:0.7 0.0000207 1.12 AML other m 2023-08-11T23:26:19.43
IV.FDMO.HHE. ML:0.6 0.00001685 0.12 AML other m 2023-08-11T23:26:19.64
IV.MOMA.HHN. ML:0.9 0.0000191 0.52 AML other m 2023-08-11T23:26:23.02
IV.ASSB.HHN. ML:1.0 0.0000202 0.16 AML other m 2023-08-11T23:26:24.05
IV.MOMA.HHE. ML:0.9 0.000020150000000000002 0.76 AML other m 2023-08-11T23:26:24.79
IV.ASSB.HHE. ML:0.8 0.000015799999999999998 0.1 AML other m 2023-08-11T23:26:24.99
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