Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 16-08-2023 and time 16:44:05 (UTC) in region 1 km SW Acquasparta (TR)

A magnitude ML 1.4 earthquake occured in region: 1 km SW Acquasparta (TR), on

  • 16-08-2023 16:44:05 (UTC)
  • 16-08-2023 18:44:05 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6800, 12.5420 at 10 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
Acquasparta TR 1 4778 4778
Montecastrilli TR 5 5022 9800
San Gemini TR 7 5018 14818
Avigliano Umbro TR 10 2558 17376
Massa Martana PG 11 3770 21146
Terni TR 16 111501 132647
Todi PG 16 16851 149498
Amelia TR 17 11897 161395
Spoleto PG 17 38218 199613
Giano dell'Umbria PG 18 3846 203459
Narni TR 18 19785 223244
Castel Ritaldi PG 19 3278 226522

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km NW of Terni (111501 inhabitants)
34 Km SW of Foligno (57155 inhabitants)
46 Km NE of Viterbo (67173 inhabitants)
49 Km S of Perugia (166134 inhabitants)
77 Km N of Guidonia Montecelio (88673 inhabitants)
79 Km W of L'Aquila (69753 inhabitants)
82 Km N of Tivoli (56533 inhabitants)
88 Km N of Roma (2864731 inhabitants)
90 Km NE of Civitavecchia (52991 inhabitants)
95 Km W of Teramo (54892 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 1.4 2023-08-16
16:44:05		 42.6798 12.5423 10 2023-08-16
16:53:15		 Sala Sismica INGV-Roma 120197321
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-08-16 16:44:05 ± 0.09
Latitude 42.6798 ± 0.0045
Longitude 12.5423 ± 0.0073
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 120197321

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 721
Semi-minor axis of confidence ellipse (meter) 173
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 58
Circular confidence region, given by single value of horizontal uncertainty (meter) 720.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 169
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 11
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) 0.12591
Epicentral distance of station farthest from the epicenter (degree) 0.53510
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 120197321
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-08-16 16:53:15
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ASSB.HHZ. 2023-08-16T16:44:20.10 1.0 undecidable manual S 13 41.3253 50 0.42 29
IV.FDMO.HHZ. 2023-08-16T16:44:16.60 0.3 undecidable manual P 48 59.3961 50 -0.02 92
IV.ATCC.EHZ. 2023-08-16T16:44:16.38 1.0 undecidable manual P 8 56.5989 50 0.19 30
IV.SACS.HHZ. 2023-08-16T16:44:15.91 0.3 undecidable manual P 290 54.8007 50 -0.01 93
IV.ARRO.EHZ. 2023-08-16T16:44:14.10 0.3 undecidable manual S 121 21.3675 114 0.13 97
IV.ASSB.HHZ. 2023-08-16T16:44:13.88 0.3 undecidable manual P 13 41.3253 50 0.04 95
IV.MOMA.HHZ. 2023-08-16T16:44:11.62 0.3 undecidable manual S 9 13.9749 124 -0.09 99
IV.GAVE.EHN. 2023-08-16T16:44:11.60 0.3 undecidable manual P 87 28.749 50 -0.29 92
IV.ARRO.EHZ. 2023-08-16T16:44:10.54 0.3 undecidable manual P 121 21.3675 114 0 99
IV.MOMA.HHZ. 2023-08-16T16:44:09.27 0.3 undecidable manual P 9 13.9749 124 0.04 100
IT.GNU.HGE. 2023-08-16T16:44:09.20 0.3 undecidable manual P 9 13.9749 124 -0.03 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HHN. ML:1.5 0.0003505 1.36 AML other m 2023-08-16T16:44:12.28
IV.MOMA.HNN. ML:1.6 0.000363 0.74 AML other m 2023-08-16T16:44:13.47
IV.MOMA.HNE. ML:1.6 0.000374 0.7 AML other m 2023-08-16T16:44:13.45
IV.MOMA.HHE. ML:1.6 0.00040649999999999996 0.86 AML other m 2023-08-16T16:44:13.45
IV.ARRO.EHN. ML:1.6 0.000293 0.48 AML other m 2023-08-16T16:44:15.26
IV.ARRO.EHE. ML:1.5 0.0002125 0.24 AML other m 2023-08-16T16:44:16.26
IV.ASSB.HHN. ML:1.2 0.00004965 0.66 AML other m 2023-08-16T16:44:22.56
IV.CAFI.HHE. ML:1.1 0.000016 1.16 AML other m 2023-08-16T16:44:23.99
IV.FDMO.HHN. ML:1.2 0.00002955 0.34 AML other m 2023-08-16T16:44:26.78
IV.ASSB.HHE. ML:1.1 0.000046200000000000005 0.28 AML other m 2023-08-16T16:44:26.94
IV.FDMO.HHE. ML:1.3 0.00004165000000000001 0.56 AML other m 2023-08-16T16:44:28.33
IV.ATCC.EHN. ML:1.3 0.0000408 0.34 AML other m 2023-08-16T16:44:28.58
IV.ATCC.EHE. ML:1.4 0.000049000000000000005 1.62 AML other m 2023-08-16T16:44:30.08
IV.CAFI.HHN. ML:1.1 0.00001675 0.5 AML other m 2023-08-16T16:44:37.25
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