Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 09-07-2023 and time 04:17:39 (Italy) in region 5 km NW Acquasparta (TR)

A magnitude ML 1.1 earthquake occured in region: 5 km NW Acquasparta (TR), on

  • 09-07-2023 02:17:39 (UTC)
  • 09-07-2023 04:17:39 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7210, 12.5000 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 5 4778 4778
Massa Martana PG 7 3770 8548
Montecastrilli TR 8 5022 13570
Avigliano Umbro TR 9 2558 16128
Todi PG 10 16851 32979
San Gemini TR 13 5018 37997
Giano dell'Umbria PG 14 3846 41843
Monte Castello di Vibio PG 18 1567 43410
Castel Ritaldi PG 18 3278 46688
Montecchio TR 18 1676 48364
Fratta Todina PG 19 1839 50203
Amelia TR 19 11897 62100
Spoleto PG 20 38218 100318
Guardea TR 20 1836 102154
Collazzone PG 20 3473 105627

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km NW of Terni (111501 inhabitants)
31 Km SW of Foligno (57155 inhabitants)
44 Km S of Perugia (166134 inhabitants)
47 Km NE of Viterbo (67173 inhabitants)
82 Km N of Guidonia Montecelio (88673 inhabitants)
84 Km W of L'Aquila (69753 inhabitants)
88 Km N of Tivoli (56533 inhabitants)
91 Km NE of Civitavecchia (52991 inhabitants)
92 Km N of Roma (2864731 inhabitants)
97 Km SE of Arezzo (99543 inhabitants)
99 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 1.1 2023-07-09
02:17:39		 42.7213 12.4998 9 2023-07-09
02:24:38		 Sala Sismica INGV-Roma 119095531
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-07-09 02:17:39 ± 0.16
Latitude 42.7213 ± 0.0045
Longitude 12.4998 ± 0.0159
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 119095531

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1285
Semi-minor axis of confidence ellipse (meter) 366
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 80
Circular confidence region, given by single value of horizontal uncertainty (meter) 1290.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 195
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.64212
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 11
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 20
Type of magnitude ML
Reference to an origin 119095531
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-07-09 02:24:38
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ASSB.HHZ. 2023-07-09T02:17:53.02 0.3 undecidable manual S 20 37.9287 50 0.03 72
IV.ATMI.HHZ. 2023-07-09T02:17:53.02 0.6 undecidable manual P 345 70.5738 50 0.5 41
IV.SMA1.EHZ. 2023-07-09T02:17:52.28 0.6 undecidable manual P 98 68.8755 50 0.01 46
IV.FIAM.HHZ. 2023-07-09T02:17:52.24 1.0 undecidable manual P 135 71.2731 50 -0.4 21
IV.MURB.HHZ. 2023-07-09T02:17:51.17 0.3 undecidable manual P 2 60.0954 50 0.25 66
IV.ARRO.EHZ. 2023-07-09T02:17:50.41 0.3 undecidable manual S 126 26.8509 109 0.6 64
IV.FDMO.HHZ. 2023-07-09T02:17:50.74 0.1 undecidable manual P 54 59.1963 50 -0.03 93
IV.NRCA.HHZ. 2023-07-09T02:17:49.39 0.1 undecidable manual P 76 51.6039 50 -0.21 91
IV.SACS.HHZ. 2023-07-09T02:17:49.44 3.0 positive manual P -0.15 0
IV.CESI.HHZ. 2023-07-09T02:17:48.52 0.3 undecidable manual P 46 45.5211 50 -0.15 70
IV.ASSB.HHZ. 2023-07-09T02:17:47.36 0.3 undecidable manual P 20 37.9287 50 -0.13 71
IV.ARRO.EHZ. 2023-07-09T02:17:45.66 0.1 undecidable manual P 126 26.8509 109 0 99
IV.CESX.HHZ. 2023-07-09T02:17:45.66 0.3 undecidable manual S 150 14.3745 122 -0.23 72
IV.MOMA.HHZ. 2023-07-09T02:17:44.77 0.1 undecidable manual S 32 10.7781 130 -0.11 99
IV.CESX.HHZ. 2023-07-09T02:17:43.31 0.1 undecidable manual P 150 14.3745 122 -0.08 99
IV.MOMA.HHZ. 2023-07-09T02:17:42.89 0.1 undecidable manual P 32 10.7781 130 0.08 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HHN. ML:1.2 0.000226 1.68 AML other m 2023-07-09T02:17:45.01
IV.MOMA.HNN. ML:1.4 0.000304 1.44 AML other m 2023-07-09T02:17:45.01
IV.MOMA.HHE. ML:1.5 0.00041549999999999996 0.32 AML other m 2023-07-09T02:17:45.46
IV.MOMA.HNE. ML:1.5 0.00038749999999999993 0.16 AML other m 2023-07-09T02:17:46.24
IV.CESX.HHE. ML:1.3 0.00020150000000000002 1.74 AML other m 2023-07-09T02:17:46.94
IV.CESX.HHN. ML:1.4 0.0002495 1.04 AML other m 2023-07-09T02:17:47.42
IV.ARRO.EHE. ML:1.0 0.00005385 0.24 AML other m 2023-07-09T02:17:50.78
IV.ARRO.EHN. ML:0.9 0.000042749999999999996 0.34 AML other m 2023-07-09T02:17:51.71
IV.ASSB.HHN. ML:1.1 0.000046 0.34 AML other m 2023-07-09T02:17:53.47
IV.ASSB.HHE. ML:1.0 0.000040900000000000005 0.52 AML other m 2023-07-09T02:17:55.69
IV.SACS.HHN. ML:0.6 0.000011230000000000001 0.5 AML other m 2023-07-09T02:17:57.04
IV.NRCA.HHE. ML:1.0 0.00002565 0.48 AML other m 2023-07-09T02:17:59.50
IV.NRCA.HHN. ML:1.1 0.0000283 0.12 AML other m 2023-07-09T02:17:59.73
IV.SACS.HHE. ML:0.8 0.00001375 0.54 AML other m 2023-07-09T02:18:00.46
IV.FDMO.HHE. ML:1.0 0.000022 1.12 AML other m 2023-07-09T02:18:00.08
IV.FDMO.HHN. ML:0.8 0.000012795 1.42 AML other m 2023-07-09T02:18:00.15
IV.SMA1.EHN. ML:0.9 0.0000174 0.66 AML other m 2023-07-09T02:18:06.46
IV.SMA1.EHE. ML:1.1 0.000018100000000000003 0.4 AML other m 2023-07-09T02:18:10.48
IV.MURB.HHN. ML:1.7 0.00010225 0.22 AML other m 2023-07-09T02:18:12.38
IV.MURB.HHE. ML:1.7 0.0000999 0.26 AML other m 2023-07-09T02:18:13.56
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