Earthquake with magnitude of ML 0.6 on date 20-02-2021 and time 03:40:44 (Italy) in region 3 km S Arquata del Tronto (AP)

A magnitude ML 0.6 earthquake occured in region: 3 km S Arquata del Tronto (AP), on

  • 20-02-2021 02:40:44 (UTC)
  • 20-02-2021 03:40:44 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.75, 13.3 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.

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 3 1178 1178
Accumoli RI 7 667 1845
Acquasanta Terme AP 9 2916 4761
Montegallo AP 11 523 5284
Amatrice RI 13 2657 7941
Valle Castellana TE 16 977 8918
Montemonaco AP 17 604 9522
Norcia PG 17 4957 14479
Cittareale RI 18 482 14961
Roccafluvione AP 19 2010 16971
Rocca Santa Maria TE 20 537 17508

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km W of Teramo (54892 inhabitants)
45 Km N of L'Aquila (69753 inhabitants)
54 Km E of Foligno (57155 inhabitants)
57 Km E of Terni (111501 inhabitants)
74 Km W of Montesilvano (53738 inhabitants)
81 Km W of Pescara (121014 inhabitants)
84 Km NW of Chieti (51815 inhabitants)
84 Km E of Perugia (166134 inhabitants)
96 Km NE of Guidonia Montecelio (88673 inhabitants)
97 Km NE of Tivoli (56533 inhabitants)
98 Km S of Ancona (100861 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 0.6 2021-02-20
02:40:44
42.75 13.3 11 2021-02-20
02:52:02
Sala Sismica INGV-Roma 87311281
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-20 02:40:44 ± 0.06
Latitude 42.75 ± 0.00
Longitude 13.30 ± 0.00
Depth (km) 11 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 87311281

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 460
Semi-minor axis of confidence ellipse (meter) 200
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 9
Circular confidence region, given by single value of horizontal uncertainty (meter) 460
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 135
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.12
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.25721
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 5
Magnitude information

ML:0.6

Field Value
Value 0.6
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 87311281
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-20 02:52:02
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.IOCA.HHZ. 2021-02-20T02:41:42.45 3.0 undecidable manual Sg 0.21 0
IV.MCI.EHZ. 2021-02-20T02:41:28.32 3.0 undecidable manual Sg 1.21 0
IV.CSP1.EHZ. 2021-02-20T02:41:04.95 3.0 undecidable manual Sg 2.29 0
IV.TERO.HHZ. 2021-02-20T02:40:54.69 0.6 undecidable manual S 119 0.2572 90 -0.22 61
IV.MC2.EHZ. 2021-02-20T02:40:52.82 0.6 undecidable manual S 334 0.1808 90 0.17 65
IV.NRCA.HHZ. 2021-02-20T02:40:51.81 0.6 undecidable manual S 302 0.1592 90 -0.2 65
IV.MMO1.EHZ. 2021-02-20T02:40:51.71 0.6 undecidable manual S 8 0.1511 90 -0.06 65
IV.TERO.HHZ. 2021-02-20T02:40:50.51 1.0 undecidable manual P 119 0.2572 90 -0.14 31
IV.SMA1.EHZ. 2021-02-20T02:40:50.77 0.6 undecidable manual S 167 0.1214 93 -0.13 65
IV.MC2.EHZ. 2021-02-20T02:40:49.46 1.0 undecidable manual P 334 0.1808 90 0.12 33
IV.SMA1.EHZ. 2021-02-20T02:40:48.49 0.3 negative manual P 167 0.1214 93 0.16 99
IV.MMO1.EHZ. 2021-02-20T02:40:48.85 0.6 undecidable manual P 8 0.1511 90 0.01 67
IV.NRCA.HHZ. 2021-02-20T02:40:48.95 0.3 undecidable manual P 302 0.1592 90 -0.03 100
IV.BARO.EHZ. 2021-02-20T02:40:47.80 3.0 undecidable manual P 1.36 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHE. ML:0.4 2.64E-5 0.7 AML other m 2021-02-20T02:40:51.21
IV.SMA1.EHN. ML:0.5 3.175E-5 0.74 AML other m 2021-02-20T02:40:51.24
IV.NRCA.HHN. ML:0.8 4.27E-5 0.06 AML other m 2021-02-20T02:41:06.03
IV.NRCA.HHE. ML:0.9 6.325E-5 0.1 AML other m 2021-02-20T02:41:06.03
IV.MCI.EHN. ML:3.5 0.001605 1.22 AML other m 2021-02-20T02:41:41.97
IV.MCI.EHE. ML:3 0.0005115 0.6 AML other m 2021-02-20T02:41:41.39
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