Earthquake with magnitude of ML 1.2 on date 22-08-2021 and time 05:08:03 (Italy) in region 4 km W Arquata del Tronto (AP)

A magnitude ML 1.2 earthquake occured in region: 4 km W Arquata del Tronto (AP), on

  • 22-08-2021 03:08:03 (UTC)
  • 22-08-2021 05:08:03 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.784, 13.246 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 4 1178 1178
Montegallo AP 10 523 1701
Accumoli RI 10 667 2368
Norcia PG 12 4957 7325
Acquasanta Terme AP 14 2916 10241
Castelsantangelo sul Nera MC 15 281 10522
Montemonaco AP 15 604 11126
Amatrice RI 17 2657 13783
Montefortino FM 19 1178 14961
Cittareale RI 20 482 15443
Ussita MC 20 444 15887
Preci PG 20 724 16611

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km W of Teramo (54892 inhabitants)
48 Km E of Foligno (57155 inhabitants)
50 Km N of L'Aquila (69753 inhabitants)
55 Km E of Terni (111501 inhabitants)
79 Km E of Perugia (166134 inhabitants)
80 Km W of Montesilvano (53738 inhabitants)
87 Km W of Pescara (121014 inhabitants)
90 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
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web 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 1.2 2021-08-22
03:08:03
42.7837 13.2455 11 2021-08-22
03:28:24
Sala Sismica INGV-Roma 94483181
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-22 03:08:03 ± 0.06
Latitude 42.7837 ± 0.0027
Longitude 13.2455 ± 0.0049
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 94483181

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 398
Semi-minor axis of confidence ellipse (meter) 291
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 68
Circular confidence region, given by single value of horizontal uncertainty (meter) 400
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 84
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 18
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
Epicentral distance of station farthest from the epicenter (degree) 0.30847
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 94483181
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-22 03:28:24
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.TERO.HHZ. 2021-08-22T03:08:15.15 0.3 undecidable manual S 121 0.3085 50 -0.33 68
IV.SSFR.HHZ. 2021-08-22T03:08:14.06 3.0 negative manual P -0.03 0
IV.MF5.EHN. 2021-08-22T03:08:14.57 0.6 undecidable manual S 37 0.2572 50 0.6 43
IV.FDMO.HHZ. 2021-08-22T03:08:14.19 0.3 undecidable manual S 335 0.2779 50 -0.39 68
IV.GAVE.EHZ. 2021-08-22T03:08:14.60 0.6 undecidable manual S 251 0.2734 50 0.15 47
IV.LNSS.HHZ. 2021-08-22T03:08:13.54 0.3 undecidable manual S 220 0.2356 50 0.23 71
IV.SMA1.EHZ. 2021-08-22T03:08:11.07 0.3 undecidable manual S 157 0.1664 120 -0.09 74
IV.TERO.HHZ. 2021-08-22T03:08:10.66 0.3 undecidable manual P 121 0.3085 50 0.13 71
IV.MC2.EHZ. 2021-08-22T03:08:10.25 0.3 undecidable manual S 342 0.134 125 0.14 73
IV.FDMO.HHZ. 2021-08-22T03:08:09.69 0.3 undecidable manual P 335 0.2779 50 -0.32 69
IV.MMO1.EHZ. 2021-08-22T03:08:09.89 0.3 undecidable manual S 27 0.1304 126 -0.09 74
IV.GAVE.EHZ. 2021-08-22T03:08:09.86 0.3 undecidable manual P 251 0.2734 50 -0.07 72
IV.NRCA.HHZ. 2021-08-22T03:08:09.26 0.3 undecidable manual S 297 0.1079 131 -0.06 75
IV.MF5.EHN. 2021-08-22T03:08:09.90 0.3 undecidable manual P 37 0.2572 50 0.24 70
IV.LNSS.HHZ. 2021-08-22T03:08:09.27 0.3 undecidable manual P 220 0.2356 50 -0.01 74
IV.SMA1.EHZ. 2021-08-22T03:08:08.06 0.3 undecidable manual P 157 0.1664 120 0.02 75
IV.NRCA.HHZ. 2021-08-22T03:08:07.03 0.1 undecidable manual P 297 0.1079 131 0.05 100
IV.MC2.EHZ. 2021-08-22T03:08:07.48 0.3 undecidable manual P 342 0.134 125 0.05 75
IV.MMO1.EHZ. 2021-08-22T03:08:07.33 0.3 undecidable manual P 27 0.1304 126 -0.02 75
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.3 0.000209 0.12 AML other m 2021-08-22T03:08:09.35
IV.NRCA.HHN. ML:1.2 0.0001805 0.12 AML other m 2021-08-22T03:08:09.35
IV.NRCA.HNE. ML:1.3 0.0002204288 0.12 AML other m 2021-08-22T03:08:09.36
IV.NRCA.HNN. ML:1.2 0.00017859005 0.1392 AML other m 2021-08-22T03:08:09.35
IV.FDMO.HHE. ML:0 4.761654E-6 2.4608 AML other m 2021-08-22T03:08:14.98
IV.FDMO.HHN. ML:0 5.885704E-6 2 AML other m 2021-08-22T03:08:14.89
IV.TERO.HHE. ML:0.9 3.6686915E-5 0.92 AML other m 2021-08-22T03:08:15.96
IV.TERO.HHN. ML:0.4 1.1050136E-5 0.08 AML other m 2021-08-22T03:08:15.88
IV.TERO.HNE. ML:1.4 0.000115189 0.56 AML other m 2021-08-22T03:08:15.39
IV.TERO.HNN. ML:1.6 0.0001521657 0.6288 AML other m 2021-08-22T03:08:14.18
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