Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 28-02-2021 and time 04:29:50 (Italy) in region 2 km W Amatrice (RI)

A magnitude ML 0.9 earthquake occured in region: 2 km W Amatrice (RI), on

  • 28-02-2021 03:29:50 (UTC)
  • 28-02-2021 04:29:50 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.6350, 13.2620 at 15 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

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 2 2657 2657
Accumoli RI 7 667 3324
Cittareale RI 9 482 3806
Campotosto AQ 12 542 4348
Montereale AQ 12 2581 6929
Capitignano AQ 13 665 7594
Arquata del Tronto AP 16 1178 8772
Borbona RI 17 617 9389
Posta RI 18 694 10083
Acquasanta Terme AP 19 2916 12999
Cagnano Amiterno AQ 20 1369 14368

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km NW of L'Aquila (69753 inhabitants)
36 Km W of Teramo (54892 inhabitants)
51 Km E of Terni (111501 inhabitants)
58 Km SE of Foligno (57155 inhabitants)
74 Km W of Montesilvano (53738 inhabitants)
80 Km W of Pescara (121014 inhabitants)
81 Km W of Chieti (51815 inhabitants)
83 Km NE of Guidonia Montecelio (88673 inhabitants)
84 Km NE of Tivoli (56533 inhabitants)
88 Km SE of Perugia (166134 inhabitants)
98 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
Reviewed
Rev100 		ML 0.9 2021-02-28
03:29:50		 42.6347 13.2618 15 2021-02-28
03:46:58		 Sala Sismica INGV-Roma 87559571
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-28 03:29:50 ± 0.11
Latitude 42.6347 ± 0.0045
Longitude 13.2618 ± 0.0061
Depth (km) 15 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 87559571

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 516
Semi-minor axis of confidence ellipse (meter) 352
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 139
Circular confidence region, given by single value of horizontal uncertainty (meter) 520.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 102
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 14
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.26890
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 7
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 87559571
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-28 03:46:58
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FOSV.EHZ. 2021-02-28T03:30:02.66 3.0 undecidable manual P -0.03 0
IV.MMO1.HNE. 2021-02-28T03:30:01.61 0.3 undecidable manual S 10 29.8479 102 0.2 72
IV.NRCA.HHZ. 2021-02-28T03:30:00.16 0.3 undecidable manual S 331 25.1526 106 -0.03 75
IV.LNSS.HHZ. 2021-02-28T03:29:58.50 0.3 undecidable manual S 259 18.4704 115 -0.01 76
IV.MMO1.HNE. 2021-02-28T03:29:57.03 0.3 undecidable manual P 10 29.8479 102 0.07 74
IV.MTRA.HNZ. 2021-02-28T03:29:57.91 0.3 undecidable manual S 39 17.4714 117 -0.36 71
IV.RM33.EHZ. 2021-02-28T03:29:57.36 0.6 undecidable manual S 196 14.4744 124 -0.23 49
IV.NRCA.HHZ. 2021-02-28T03:29:56.24 0.1 undecidable manual P 331 25.1526 106 -0.02 100
IV.SMA1.EHZ. 2021-02-28T03:29:56.10 0.3 undecidable manual S 94 5.994 153 0.03 77
IV.T1299.HNZ. 2021-02-28T03:29:55.62 0.6 undecidable manual S 92 1.6983 172 -0.1 52
IV.LNSS.HHZ. 2021-02-28T03:29:55.26 0.3 undecidable manual P 259 18.4704 115 -0.03 76
IV.MTRA.HNZ. 2021-02-28T03:29:55.13 0.3 undecidable manual P 39 17.4714 117 -0.02 76
IV.RM33.EHZ. 2021-02-28T03:29:54.76 0.3 undecidable manual P 196 14.4744 124 0 77
IV.SMA1.EHZ. 2021-02-28T03:29:54.07 0.3 undecidable manual P 94 5.994 153 0.19 75
IV.T1299.HNZ. 2021-02-28T03:29:53.76 0.3 undecidable manual P 92 1.6983 172 0.08 77
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RM33.EHE. ML:0.7 0.000044083985000000006 0.12 AML other m 2021-02-28T03:29:57.74
IV.RM33.EHN. ML:0.9 0.000067410605 1.3392 AML other m 2021-02-28T03:29:57.52
IV.RM33.HNE. ML:1.0 0.000089718215 0.9504 AML other m 2021-02-28T03:29:57.68
IV.RM33.HNN. ML:1.1 0.000100186375 1.0096 AML other m 2021-02-28T03:29:57.52
IV.LNSS.HHE. ML:1.0 0.0000660025 1.2192 AML other m 2021-02-28T03:29:58.73
IV.LNSS.HHN. ML:1.0 0.00006453986 0.3792 AML other m 2021-02-28T03:29:58.66
IV.NRCA.HHE. ML:0.8 0.00003556507000000001 0.12 AML other m 2021-02-28T03:30:00.59
IV.NRCA.HHN. ML:0.6 0.000022031784999999997 0.1392 AML other m 2021-02-28T03:30:00.39
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