Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 19-10-2021 and time 00:56:56 (Italy) in region 6 km SE Preci (PG)

A magnitude ML 1.1 earthquake occured in region: 6 km SE Preci (PG), on

  • 18-10-2021 22:56:56 (UTC)
  • 19-10-2021 00:56:56 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8510, 13.1000 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
Preci PG 6 724 724
Norcia PG 6 4957 5681
Castelsantangelo sul Nera MC 7 281 5962
Visso MC 9 1107 7069
Ussita MC 11 444 7513
Sellano PG 15 1079 8592
Cerreto di Spoleto PG 15 1075 9667
Cascia PG 16 3217 12884
Monte Cavallo MC 18 145 13029
Arquata del Tronto AP 18 1178 14207
Bolognola MC 19 142 14349
Montegallo AP 19 523 14872
Montemonaco AP 19 604 15476

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km E of Foligno (57155 inhabitants)
49 Km NE of Terni (111501 inhabitants)
54 Km W of Teramo (54892 inhabitants)
61 Km NW of L'Aquila (69753 inhabitants)
65 Km E of Perugia (166134 inhabitants)
92 Km SW of Ancona (100861 inhabitants)
94 Km W of Montesilvano (53738 inhabitants)
95 Km NE of Viterbo (67173 inhabitants)
99 Km NE of Guidonia Montecelio (88673 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 2021-10-18
22:56:56		 42.8508 13.1003 11 2021-10-18
23:02:33		 Sala Sismica INGV-Roma 96739301
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-18 22:56:56 ± 0.12
Latitude 42.8508 ± 0.0054
Longitude 13.1003 ± 0.0086
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 96739301

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 778
Semi-minor axis of confidence ellipse (meter) 223
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 123
Circular confidence region, given by single value of horizontal uncertainty (meter) 780.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 133
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) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.01979
Epicentral distance of station farthest from the epicenter (degree) 0.25271
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.4
Num. used stations 10
Type of magnitude ML
Reference to an origin 96739301
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-18 23:02:33
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-10-18T22:57:06.43 0.3 undecidable manual S 18 28.0497 90 0.11 72
IV.FDMO.HHZ. 2021-10-18T22:57:04.05 0.3 undecidable manual S 357 20.6682 91 -0.29 70
IV.MMO1.EHZ. 2021-10-18T22:57:03.62 0.3 undecidable manual S 74 19.1697 91 -0.33 71
IV.CSP1.EHZ. 2021-10-18T22:57:02.13 0.1 undecidable manual P 18 28.0497 90 0.02 98
IV.MC2.EHZ. 2021-10-18T22:57:01.81 0.3 undecidable manual S 47 9.879 121 0.28 72
IV.GAVE.EHZ. 2021-10-18T22:57:01.64 0.1 undecidable manual P 224 24.3534 90 0.1 98
IV.MMO1.EHZ. 2021-10-18T22:57:00.73 0.1 undecidable manual P 74 19.1697 91 -0.02 100
IV.NRCA.HHZ. 2021-10-18T22:57:00.12 0.3 undecidable manual S 150 2.1978 165 -0.2 73
IV.FDMO.HHZ. 2021-10-18T22:57:00.96 0.1 undecidable manual P 357 20.6682 91 -0.01 100
IV.MC2.EHZ. 2021-10-18T22:56:59.58 0.1 undecidable manual P 47 9.879 121 0.23 97
IV.NRCA.HHZ. 2021-10-18T22:56:58.76 0.6 undecidable manual P 150 2.1978 165 0.11 51
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.2 0.000252 0.12 AML other m 2021-10-18T22:57:00.28
IV.NRCA.HHE. ML:1.1 0.0002065 0.12 AML other m 2021-10-18T22:57:00.33
IV.NRCA.HNE. ML:1.0 0.0001823707 0.128 AML other m 2021-10-18T22:57:00.40
IV.NRCA.HNN. ML:1.2 0.00028084335 0.1408 AML other m 2021-10-18T22:57:00.22
IV.GAVE.EHE. ML:0.2 0.0000088043355 0.1536 AML other m 2021-10-18T22:57:06.30
IV.GAVE.EHN. ML:0.2 0.0000111043245 0.1152 AML other m 2021-10-18T22:57:06.30
IV.GAVE.HNE. ML:1.8 0.00041487168 1.0752 AML other m 2021-10-18T22:57:13.62
IV.GAVE.HNN. ML:1.6 0.00024884175 0.8192 AML other m 2021-10-18T22:57:07.56
IV.CSP1.EHE. ML:1.0 0.00004304906 0.7808 AML other m 2021-10-18T22:57:05.75
IV.CSP1.EHN. ML:0.9 0.000042309356499999996 1.2672 AML other m 2021-10-18T22:57:14.53
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