Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 28-02-2021 and time 04:29:44 (UTC) in region 6 km W Arquata del Tronto (AP)

A magnitude ML 1.6 earthquake occured in region: 6 km W Arquata del Tronto (AP), on

  • 28-02-2021 04:29:44 (UTC)
  • 28-02-2021 05:29:44 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.79, 13.22 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.

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
Arquata del Tronto AP 6 1178 1178
Montegallo AP 11 523 1701
Norcia PG 11 4957 6658
Accumoli RI 11 667 7325
Castelsantangelo sul Nera MC 13 281 7606
Montemonaco AP 15 604 8210
Acquasanta Terme AP 15 2916 11126
Preci PG 18 724 11850
Ussita MC 18 444 12294
Amatrice RI 19 2657 14951
Cascia PG 19 3217 18168
Visso MC 19 1107 19275
Montefortino FM 20 1178 20453
Cittareale RI 20 482 20935

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km W of Teramo (54892 inhabitants)
46 Km E of Foligno (57155 inhabitants)
51 Km N of L'Aquila (69753 inhabitants)
54 Km E of Terni (111501 inhabitants)
77 Km E of Perugia (166134 inhabitants)
82 Km W of Montesilvano (53738 inhabitants)
89 Km W of Pescara (121014 inhabitants)
91 Km NW of Chieti (51815 inhabitants)
95 Km S of Ancona (100861 inhabitants)
97 Km NE of Guidonia Montecelio (88673 inhabitants)
98 Km NE of Tivoli (56533 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.6 2021-02-28
04:29:44		 42.79 13.22 9 2021-02-28
04:38:26		 Sala Sismica INGV-Roma 87559941
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-28 04:29:44 ± 0.07
Latitude 42.79 ± 0.00
Longitude 13.22 ± 0.01
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 87559941

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 490
Semi-minor axis of confidence ellipse (meter) 61
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 273
Circular confidence region, given by single value of horizontal uncertainty (meter) 490
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 82
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.34714
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 13
Magnitude information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 17
Type of magnitude ML
Reference to an origin 87559941
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-28 04:38:26
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.EL6.EHZ. 2021-02-28T04:30:05.25 3.0 undecidable manual S 0.03 0
IV.PF6.EHN. 2021-02-28T04:29:57.38 0.6 undecidable manual S 356 0.3471 50 -0.04 48
IV.GUMA.HHZ. 2021-02-28T04:29:56.44 0.3 undecidable manual S 17 0.2833 50 0.91 56
IV.RM33.HNZ. 2021-02-28T04:29:55.57 0.6 undecidable manual S 181 0.2824 50 0.07 48
IV.MF5.EHZ. 2021-02-28T04:29:55.29 0.3 undecidable manual S 41 0.2608 107 0.5 66
IV.CSP1.EHZ. 2021-02-28T04:29:55.78 0.3 undecidable manual S 357 0.3004 50 -0.27 69
IV.FDMO.HHZ. 2021-02-28T04:29:54.74 0.3 undecidable manual S 338 0.2644 107 -0.18 71
IV.LNSS.HHZ. 2021-02-28T04:29:54.10 0.3 undecidable manual S 216 0.232 109 0.39 69
IV.TERO.HHZ. 2021-02-28T04:29:51.02 3.0 positive manual P -0.32 0
IV.PF6.EHN. 2021-02-28T04:29:51.56 0.3 undecidable manual P 356 0.3471 50 -0.29 68
IV.MC2.EHZ. 2021-02-28T04:29:50.04 0.3 undecidable manual S 348 0.1232 124 0.11 74
IV.CSP1.EHZ. 2021-02-28T04:29:50.76 0.3 undecidable manual P 357 0.3004 50 -0.3 69
IV.GUMA.HHZ. 2021-02-28T04:29:50.82 0.3 undecidable manual P 17 0.2833 50 0.06 73
IV.RM33.HNZ. 2021-02-28T04:29:50.50 0.3 undecidable manual P 181 0.2824 50 -0.24 70
IV.MF5.EHZ. 2021-02-28T04:29:50.52 0.1 undecidable manual P 41 0.2608 107 0.19 95
IV.FDMO.HHZ. 2021-02-28T04:29:50.17 0.3 undecidable manual P 338 0.2644 107 -0.23 70
IV.MMO1.EHZ. 2021-02-28T04:29:49.91 0.3 undecidable manual S 35 0.1313 122 -0.3 71
IV.LNSS.HHZ. 2021-02-28T04:29:49.60 0.3 undecidable manual P 216 0.232 109 -0.11 73
IV.MTRA.EHZ. 2021-02-28T04:29:49.88 0.3 undecidable manual S 105 0.1313 122 -0.31 71
IV.NRCA.HHZ. 2021-02-28T04:29:48.99 0.3 undecidable manual S 298 0.0908 132 0.03 76
IV.SMA1.EHZ. 2021-02-28T04:29:48.48 0.3 undecidable manual P 153 0.1799 114 -0.16 73
IV.T1299.EHZ. 2021-02-28T04:29:48.48 0.3 undecidable manual P 165 0.1628 117 0.19 73
IV.MTRA.EHZ. 2021-02-28T04:29:47.78 0.3 undecidable manual P 105 0.1313 122 0.11 74
IV.MC2.EHZ. 2021-02-28T04:29:47.63 0.3 undecidable manual P 348 0.1232 124 0.11 74
IV.MMO1.EHZ. 2021-02-28T04:29:47.52 0.1 undecidable manual P 35 0.1313 122 -0.17 98
IV.NRCA.HHZ. 2021-02-28T04:29:47.06 0.1 undecidable manual P 298 0.0908 132 0.09 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.6 0.000586 0.68 AML other m 2021-02-28T04:29:49.37
IV.NRCA.HHN. ML:1.6 0.0006295 0.3 AML other m 2021-02-28T04:29:49.31
IV.MTRA.EHN. ML:1.7 0.0004755 0.36 AML other m 2021-02-28T04:29:50.49
IV.MTRA.HNE. ML:1.6 0.000393 0.24 AML other m 2021-02-28T04:29:50.87
IV.MTRA.EHE. ML:1.6 0.0003805 0.24 AML other m 2021-02-28T04:29:50.87
IV.MTRA.HNN. ML:1.7 0.000571 0.98 AML other m 2021-02-28T04:29:50.48
IV.LNSS.HHE. ML:1.4 0.00015 0.14 AML other m 2021-02-28T04:29:54.84
IV.LNSS.HHN. ML:1.3 0.00010805 0.32 AML other m 2021-02-28T04:29:55.12
IV.NRCA.HNN. ML:1.6 0.0005163983 0.08 AML other m 2021-02-28T04:29:49.46
IV.FDMO.HHE. ML:1 5.3782855E-5 0.24 AML other m 2021-02-28T04:29:55.18
IV.FDMO.HHN. ML:1 5.725176E-5 0.24 AML other m 2021-02-28T04:29:55.60
IV.MF5.EHN. ML:1.1 7.1739208E-5 1.1392 AML other m 2021-02-28T04:29:55.07
IV.CSP1.EHE. ML:1.6 0.00017274985 1.3184 AML other m 2021-02-28T04:29:56.69
IV.CSP1.EHN. ML:1.7 0.000200722155 0.32 AML other m 2021-02-28T04:29:56.60
IV.GUMA.HHE. ML:1.9 0.0003980394 0.3584 AML other m 2021-02-28T04:29:57.11
IV.GUMA.HHN. ML:1.6 0.00018980353 0.3616 AML other m 2021-02-28T04:29:57.04
IV.GUMA.HNE. ML:1.8 0.00029740645 0.2784 AML other m 2021-02-28T04:29:57.08
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download