Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 17-02-2021 and time 23:26:58 (Italy) in region 3 km W Amatrice (RI)

A magnitude ML 0.9 earthquake occured in region: 3 km W Amatrice (RI), on

  • 17-02-2021 22:26:58 (UTC)
  • 17-02-2021 23:26:58 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.6320, 13.2520 at 12 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
Amatrice RI 3 2657 2657
Accumoli RI 7 667 3324
Cittareale RI 8 482 3806
Montereale AQ 12 2581 6387
Campotosto AQ 13 542 6929
Capitignano AQ 13 665 7594
Arquata del Tronto AP 16 1178 8772
Borbona RI 16 617 9389
Posta RI 17 694 10083
Cagnano Amiterno AQ 19 1369 11452

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km NW of L'Aquila (69753 inhabitants)
37 Km W of Teramo (54892 inhabitants)
50 Km E of Terni (111501 inhabitants)
57 Km SE of Foligno (57155 inhabitants)
75 Km W of Montesilvano (53738 inhabitants)
81 Km W of Pescara (121014 inhabitants)
81 Km W of Chieti (51815 inhabitants)
82 Km NE of Guidonia Montecelio (88673 inhabitants)
83 Km NE of Tivoli (56533 inhabitants)
88 Km SE of Perugia (166134 inhabitants)
97 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
Bulletin
Rev1000 		ML 0.9 2021-02-17
22:26:58		 42.6317 13.2515 12 2021-07-12
16:55:01		 Bollettino Sismico Italiano INGV 87789781
Reviewed
Rev100 		ML 0.9 2021-02-17
22:26:58		 42.6213 13.2487 12 2021-02-17
22:30:53		 Sala Sismica INGV-Roma 87256461
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-17 22:26:58 ± 0.07
Latitude 42.6317 ± 0.0036
Longitude 13.2515 ± 0.0049
Depth (km) 12 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 87789781

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 369
Semi-minor axis of confidence ellipse (meter) 62
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 301
Circular confidence region, given by single value of horizontal uncertainty (meter) 370.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 67
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
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) 0.02248
Epicentral distance of station farthest from the epicenter (degree) 0.38761
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 87789781
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-03-05 17:10:23

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 87256461
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-17 22:30:53
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TERO.HHZ. 2021-02-17T22:27:08.00 0.6 undecidable manual S 92 28.749 92 -0.24 47
IV.GAVE.EHZ. 2021-02-17T22:27:08.37 0.3 undecidable manual S 283 29.9478 92 -0.18 72
IV.MMO1.EHZ. 2021-02-17T22:27:08.76 0.3 undecidable manual S 12 30.3474 92 0.1 73
IV.NRCA.HHZ. 2021-02-17T22:27:07.06 0.3 undecidable manual S 334 25.0527 93 -0.18 72
IV.MF5.EHZ. 2021-02-17T22:27:06.41 0.6 undecidable manual P 23 43.0236 91 0.26 46
IV.ARRO.EHZ. 2021-02-17T22:27:05.70 0.6 undecidable manual P 262 40.1265 91 0 48
IV.MTRA.HNZ. 2021-02-17T22:27:05.30 0.3 undecidable manual S 40 18.2706 96 -0.13 73
IV.LNSS.HHZ. 2021-02-17T22:27:05.06 0.3 undecidable manual S 260 17.5713 97 -0.18 73
IV.RM33.EHZ. 2021-02-17T22:27:04.01 0.3 undecidable manual S 193 13.9749 106 -0.3 73
IV.CAMP.HHZ. 2021-02-17T22:27:04.81 0.3 undecidable manual S 130 16.6722 98 -0.21 73
IV.GAVE.EHZ. 2021-02-17T22:27:04.11 0.3 undecidable manual P 283 29.9478 92 -0.02 74
IV.MMO1.EHZ. 2021-02-17T22:27:04.33 0.3 undecidable manual P 12 30.3474 92 0.14 72
IV.NRCA.HHZ. 2021-02-17T22:27:03.42 0.1 undecidable manual P 334 25.0527 93 0.04 99
IV.TERO.HHZ. 2021-02-17T22:27:03.88 0.3 undecidable manual P 92 28.749 92 -0.08 74
IV.SMA1.EHZ. 2021-02-17T22:27:02.85 0.3 undecidable manual S 91 6.8931 139 0.13 76
IV.MTRA.HNZ. 2021-02-17T22:27:02.06 0.3 undecidable manual P 40 18.2706 96 -0.27 72
IV.CAMP.HHZ. 2021-02-17T22:27:02.21 0.6 undecidable manual P 130 16.6722 98 0.11 49
IV.LNSS.HHZ. 2021-02-17T22:27:02.40 0.1 positive manual P 260 17.5713 97 0.17 97
IV.T1299.HNZ. 2021-02-17T22:27:01.93 0.1 undecidable manual S 84 2.4975 164 -0.25 98
IV.SMA1.EHZ. 2021-02-17T22:27:01.17 0.1 positive manual P 91 6.8931 139 0.4 95
IV.RM33.EHZ. 2021-02-17T22:27:01.89 0.3 positive manual P 193 13.9749 106 0.21 72
IV.T1299.HNZ. 2021-02-17T22:27:00.64 0.1 undecidable manual P 84 2.4975 164 0.19 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHE. ML:1.7 0.0006855 0.28 AML other m 2021-02-17T22:27:03.15
IV.SMA1.EHN. ML:1.3 0.000266 0.88 AML other m 2021-02-17T22:27:03.28
IV.RM33.EHE. ML:0.8 0.000057499999999999995 0.56 AML other m 2021-02-17T22:27:04.65
IV.RM33.EHN. ML:0.8 0.00006695 1.36 AML other m 2021-02-17T22:27:04.30
IV.LNSS.HHN. ML:0.7 0.0000395 0.5 AML other m 2021-02-17T22:27:05.34
IV.LNSS.HHE. ML:0.7 0.0000409 0.52 AML other m 2021-02-17T22:27:05.14
IV.NRCA.HHN. ML:1.0 0.00005865 0.16 AML other m 2021-02-17T22:27:07.34
IV.NRCA.HHE. ML:1.0 0.000053599999999999995 0.1 AML other m 2021-02-17T22:27:07.43
IV.TERO.HHE. ML:0.7 0.0000269 0.1 AML other m 2021-02-17T22:27:08.78
IV.GAVE.EHN. ML:0.9 0.00003645 1.4 AML other m 2021-02-17T22:27:09.86
IV.TERO.HHN. ML:0.8 0.0000348 0.3 AML other m 2021-02-17T22:27:09.23
IV.GAVE.EHE. ML:0.9 0.00003655 1.3 AML other m 2021-02-17T22:27:09.91
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