Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 09-10-2023 and time 19:49:21 (UTC) in region 1 km E Acquasparta (TR)

A magnitude ML 0.9 earthquake occured in region: 1 km E Acquasparta (TR), on

  • 09-10-2023 19:49:21 (UTC)
  • 09-10-2023 21:49:21 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6910, 12.5630 at 9 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 8 5022 9800
San Gemini TR 9 5018 14818
Massa Martana PG 10 3770 18588
Avigliano Umbro TR 12 2558 21146
Spoleto PG 15 38218 59364
Terni TR 16 111501 170865
Giano dell'Umbria PG 16 3846 174711
Todi PG 16 16851 191562
Castel Ritaldi PG 17 3278 194840
Amelia TR 19 11897 206737
Narni TR 19 19785 226522
Montefranco TR 20 1276 227798

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km NW of Terni (111501 inhabitants)
32 Km SW of Foligno (57155 inhabitants)
48 Km NE of Viterbo (67173 inhabitants)
48 Km SE of Perugia (166134 inhabitants)
78 Km N of Guidonia Montecelio (88673 inhabitants)
78 Km W of L'Aquila (69753 inhabitants)
83 Km N of Tivoli (56533 inhabitants)
89 Km N of Roma (2864731 inhabitants)
92 Km NE of Civitavecchia (52991 inhabitants)
94 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 0.9 2023-10-09
19:49:21		 42.6912 12.5628 9 2023-10-09
20:36:36		 Sala Sismica INGV-Roma 121941841
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-10-09 19:49:21 ± 0.08
Latitude 42.6912 ± 0.0036
Longitude 12.5628 ± 0.0061
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121941841

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 557
Semi-minor axis of confidence ellipse (meter) 302
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 245
Circular confidence region, given by single value of horizontal uncertainty (meter) 560.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 136
Number of associated phases, regardless of their use for origin computation 28
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.40110
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 121941841
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-10-09 20:36:36
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PRMA.HHZ. 2023-10-09T19:50:42.31 3.0 undecidable manual Sg 2.16 0
7C.SPAOL.HNZ. 2023-10-09T19:50:41.19 3.0 undecidable manual Pg -3.2 0
SI.BOSI.HHZ. 2023-10-09T19:50:31.61 3.0 positive manual Pg 8.62 0
IV.MCRV.HHZ. 2023-10-09T19:50:19.25 3.0 undecidable manual Sn -9.99 0
IV.FNVD.HHZ. 2023-10-09T19:50:19.52 3.0 undecidable manual Sg -0.44 0
OT.OT15.EHZ. 2023-10-09T19:50:17.79 3.0 negative manual Pg -0.35 0
IV.SELL.HHZ. 2023-10-09T19:50:16.14 3.0 undecidable manual Pn -9.99 0
ST.CARE.HNZ. 2023-10-09T19:50:12.66 3.0 negative manual Pn -9.99 0
IV.APRC.HHZ. 2023-10-09T19:50:00.90 3.0 undecidable manual Pg -0.92 0
IV.CING.HHZ. 2023-10-09T19:49:59.01 3.0 undecidable manual S 100
IV.MCRV.HHZ. 2023-10-09T19:49:59.27 3.0 undecidable manual Pg -7.11 0
IV.CESI.HNE. 2023-10-09T19:49:36.00 0.6 undecidable manual S 39 44.5221 50 0.18 46
IV.MGAB.HHN. 2023-10-09T19:49:35.46 0.6 undecidable manual S 304 44.1225 50 -0.25 45
IV.ASSB.HHZ. 2023-10-09T19:49:34.63 0.6 undecidable manual S 11 39.7269 50 0.09 47
IV.LNSS.HNN. 2023-10-09T19:49:34.90 0.6 undecidable manual S 104 40.1265 50 0.25 45
IV.GIUL.HHZ. 2023-10-09T19:49:30.66 3.0 negative manual P -9.99 0
IV.GAVE.HNZ. 2023-10-09T19:49:30.54 0.6 undecidable manual S 90 27.0507 109 -0.41 45
IV.LNSS.HNN. 2023-10-09T19:49:29.12 0.6 undecidable manual P 104 40.1265 50 0.22 46
IV.MGAB.HHN. 2023-10-09T19:49:29.35 0.3 undecidable manual P 304 44.1225 50 -0.16 69
IV.CESI.HNE. 2023-10-09T19:49:29.26 0.6 undecidable manual P 39 44.5221 50 -0.32 44
IV.ASSB.HHZ. 2023-10-09T19:49:28.80 0.1 undecidable manual P 11 39.7269 50 -0.04 95
IV.GAVE.HNZ. 2023-10-09T19:49:26.60 0.1 undecidable manual P 90 27.0507 109 -0.16 94
IV.MOMA.HHZ. 2023-10-09T19:49:26.31 0.3 undecidable manual S 3 12.4764 126 -0.11 73
IT.GNU.HGZ. 2023-10-09T19:49:26.32 0.3 undecidable manual S 3 12.4764 126 -0.1 73
IV.CESX.HHZ. 2023-10-09T19:49:25.61 0.3 undecidable manual S 168 9.3795 134 0.01 75
IT.GNU.HGZ. 2023-10-09T19:49:24.54 0.1 undecidable manual P 3 12.4764 126 0.39 92
IV.MOMA.HHZ. 2023-10-09T19:49:24.35 0.3 positive manual P 3 12.4764 126 0.2 72
IV.CESX.HHZ. 2023-10-09T19:49:23.70 0.1 undecidable manual P 168 9.3795 134 0.03 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HHE. ML:1.2 0.0001753564 0.1024 AML other m 2023-10-09T19:49:26.95
IV.MOMA.HHN. ML:1.1 0.0001375 0.16 AML other m 2023-10-09T19:49:28.47
IV.CESX.HHE. ML:0.9 0.00010801839 0.256 AML other m 2023-10-09T19:49:27.83
IV.CESX.HHN. ML:0.8 0.00009723688499999999 0.1408 AML other m 2023-10-09T19:49:26.64
IV.MOMA.HNE. ML:1.1 0.0001468562 0.0896 AML other m 2023-10-09T19:49:26.96
IV.MOMA.HNN. ML:1.1 0.00013592648 0.1152 AML other m 2023-10-09T19:49:27.01
IV.ASSB.HHE. ML:0.5 0.000010746942 0.0768 AML other m 2023-10-09T19:49:36.76
IV.ASSB.HHN. ML:0.5 0.0000100421935 0.1792 AML other m 2023-10-09T19:49:36.93
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