Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 23-02-2021 and time 21:14:24 (UTC) in region 1 km N Amatrice (RI)

A magnitude ML 0.9 earthquake occured in region: 1 km N Amatrice (RI), on

  • 23-02-2021 21:14:24 (UTC)
  • 23-02-2021 22:14:24 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.64, 13.29 at 12 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
Amatrice RI 1 2657 2657
Accumoli RI 7 667 3324
Cittareale RI 11 482 3806
Campotosto AQ 11 542 4348
Montereale AQ 13 2581 6929
Capitignano AQ 13 665 7594
Arquata del Tronto AP 15 1178 8772
Acquasanta Terme AP 18 2916 11688
Cortino TE 18 656 12344
Crognaleto TE 19 1297 13641
Borbona RI 19 617 14258

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km N of L'Aquila (69753 inhabitants)
34 Km W of Teramo (54892 inhabitants)
53 Km E of Terni (111501 inhabitants)
59 Km SE of Foligno (57155 inhabitants)
72 Km W of Montesilvano (53738 inhabitants)
78 Km W of Pescara (121014 inhabitants)
79 Km W of Chieti (51815 inhabitants)
85 Km NE of Guidonia Montecelio (88673 inhabitants)
85 Km NE of Tivoli (56533 inhabitants)
90 Km SE of Perugia (166134 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 0.9 2021-02-23
21:14:24		 42.64 13.29 12 2021-02-23
21:24:13		 Sala Sismica INGV-Roma 87416851
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-23 21:14:24 ± 0.07
Latitude 42.64 ± 0.00
Longitude 13.29 ± 0.00
Depth (km) 12 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 87416851

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 383
Semi-minor axis of confidence ellipse (meter) 198
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 255
Circular confidence region, given by single value of horizontal uncertainty (meter) 380
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 72
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 21
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
Epicentral distance of station farthest from the epicenter (degree) 0.29498
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 11
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 87416851
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-23 21:24:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CRTC.HHZ. 2021-02-23T21:15:01.19 3.0 undecidable manual S -0.19 0
IV.VVLD.HHZ. 2021-02-23T21:14:40.06 3.0 undecidable manual P 0.26 0
IV.MC2.EHZ. 2021-02-23T21:14:35.18 0.3 undecidable manual S 345 0.2833 93 0.31 69
IV.GAVE.EHZ. 2021-02-23T21:14:34.90 0.3 undecidable manual S 281 0.295 92 -0.33 68
IV.GIGS.HHE. 2021-02-23T21:14:34.57 0.3 undecidable manual S 131 0.2788 93 -0.16 72
IV.MMO1.EHZ. 2021-02-23T21:14:34.29 0.3 undecidable manual S 6 0.2626 93 0.02 74
IV.TERO.HHZ. 2021-02-23T21:14:33.08 0.3 undecidable manual S 94 0.232 94 -0.27 71
IV.NRCA.HHZ. 2021-02-23T21:14:33.11 0.3 undecidable manual S 327 0.2338 94 -0.31 70
IV.LNSS.HHZ. 2021-02-23T21:14:31.85 0.3 undecidable manual S 259 0.1862 96 -0.15 72
IV.MC2.EHZ. 2021-02-23T21:14:31.09 1.0 undecidable manual P 345 0.2833 93 0.81 20
IV.GAVE.EHZ. 2021-02-23T21:14:30.50 0.1 undecidable manual P 281 0.295 92 0.01 98
IV.MTRA.HNZ. 2021-02-23T21:14:30.53 0.3 undecidable manual S 33 0.143 104 -0.2 73
IV.GIGS.HHE. 2021-02-23T21:14:30.26 0.6 undecidable manual P 131 0.2788 93 0.05 48
IV.MMO1.EHZ. 2021-02-23T21:14:29.99 0.1 undecidable manual P 6 0.2626 93 0.05 97
IV.TERO.HHZ. 2021-02-23T21:14:29.40 0.1 undecidable manual P 94 0.232 94 -0.01 99
IV.NRCA.HHZ. 2021-02-23T21:14:29.39 0.1 undecidable manual P 327 0.2338 94 -0.05 98
IV.SMA1.EHZ. 2021-02-23T21:14:28.02 0.3 undecidable manual S 102 0.0351 157 -0.27 73
IV.LNSS.HHZ. 2021-02-23T21:14:28.69 0.1 positive manual P 259 0.1862 96 0.06 99
IV.RM33.EHZ. 2021-02-23T21:14:28.00 0.1 undecidable manual P 203 0.1394 105 0.16 98
IV.T1299.HNZ. 2021-02-23T21:14:28.08 0.3 undecidable manual S 237 0.0063 176 -0.02 77
IV.MTRA.HNZ. 2021-02-23T21:14:27.94 0.1 undecidable manual P 33 0.143 104 0.04 100
IV.T1299.HNZ. 2021-02-23T21:14:26.63 0.1 undecidable manual P 237 0.0063 176 0.26 99
IV.SMA1.EHZ. 2021-02-23T21:14:26.78 0.1 undecidable manual P 102 0.0351 157 0.3 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHN. ML:0.8 0.000101320655 0.2048 AML other m 2021-02-23T21:14:28.72
IV.SMA1.EHE. ML:1.1 0.00017535435 0.1792 AML other m 2021-02-23T21:14:28.67
IV.RM33.EHN. ML:0.7 4.3339825E-5 0.2304 AML other m 2021-02-23T21:14:32.03
IV.RM33.EHE. ML:0.9 7.6482075E-5 0.1408 AML other m 2021-02-23T21:14:30.94
IV.LNSS.HHN. ML:1 6.3879075E-5 0.1408 AML other m 2021-02-23T21:14:32.06
IV.LNSS.HHE. ML:1.1 8.65E-5 0.14 AML other m 2021-02-23T21:14:32.10
IV.TERO.HHN. ML:1 6.23E-5 0.08 AML other m 2021-02-23T21:14:33.18
IV.NRCA.HHN. ML:0.7 2.585842E-5 0.1408 AML other m 2021-02-23T21:14:33.33
IV.NRCA.HHE. ML:1 5.8591905E-5 0.0768 AML other m 2021-02-23T21:14:33.35
IV.TERO.HHE. ML:0.7 3.078701E-5 0.0768 AML other m 2021-02-23T21:14:33.36
IV.RM33.HNE. ML:1 9.119454E-5 0.2048 AML other m 2021-02-23T21:14:30.92
IV.RM33.HNN. ML:0.8 5.281057E-5 0.1408 AML other m 2021-02-23T21:14:30.97
IV.NRCA.HNE. ML:1 5.633103E-5 0.0768 AML other m 2021-02-23T21:14:33.36
IV.TERO.HNN. ML:1.2 7.863768E-5 0.1024 AML other m 2021-02-23T21:14:33.18
IV.GAVE.EHE. ML:0.8 2.39200565E-5 0.2048 AML other m 2021-02-23T21:14:37.79
IV.GAVE.EHN. ML:0.7 1.94376295E-5 0.1792 AML other m 2021-02-23T21:14:37.38
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