Earthquake with magnitude of ML 1.6 on date 20-07-2021 and time 17:39:26 (UTC) in region 2 km W Campotosto (AQ)

A magnitude ML 1.6 earthquake occured in region: 2 km W Campotosto (AQ), on

  • 20-07-2021 17:39:26 (UTC)
  • 20-07-2021 19:39:26 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.564, 13.346 at 8 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
Campotosto AQ 2 542 542
Capitignano AQ 6 665 1207
Amatrice RI 9 2657 3864
Montereale AQ 9 2581 6445
Crognaleto TE 11 1297 7742
Barete AQ 14 737 8479
Pizzoli AQ 15 4326 12805
Cortino TE 15 656 13461
Cagnano Amiterno AQ 15 1369 14830
Fano Adriano TE 16 296 15126
Cittareale RI 16 482 15608
Accumoli RI 17 667 16275
Pietracamela TE 18 271 16546
Borbona RI 18 617 17163

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km N of L'Aquila (69753 inhabitants)
31 Km W of Teramo (54892 inhabitants)
57 Km E of Terni (111501 inhabitants)
66 Km W of Montesilvano (53738 inhabitants)
68 Km SE of Foligno (57155 inhabitants)
72 Km W of Chieti (51815 inhabitants)
72 Km W of Pescara (121014 inhabitants)
80 Km NE of Tivoli (56533 inhabitants)
81 Km NE of Guidonia Montecelio (88673 inhabitants)
99 Km SE of Perugia (166134 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 1.6 2021-07-20
17:39:26
42.5643 13.3458 8 2021-07-20
17:44:25
Sala Sismica INGV-Roma 92993371
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-20 17:39:26 ± 0.07
Latitude 42.5643 ± 0.0045
Longitude 13.3458 ± 0.0049
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 92993371

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 392
Semi-minor axis of confidence ellipse (meter) 342
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 211
Circular confidence region, given by single value of horizontal uncertainty (meter) 390
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 31
Number of defining phases 26
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.5369
Number of stations at which the event was observed 20
Number of stations from which data was used for origin computation 15
Magnitude information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 22
Type of magnitude ML
Reference to an origin 92993371
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-20 17:44:25
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.LAV9.HNZ. 2021-07-20T17:40:01.37 3.0 undecidable manual S -0.46 0
IV.MIDA.HHZ. 2021-07-20T17:39:49.12 3.0 positive manual P 0.37 0
IV.POFI.HHZ. 2021-07-20T17:39:46.29 3.0 undecidable manual P 1.77 0
IV.CSP1.EHZ. 2021-07-20T17:39:46.26 0.6 undecidable manual S 349 0.5369 50 0.57 41
IV.RMP.HHZ. 2021-07-20T17:39:43.48 3.0 positive manual P -0.78 0
IV.MF5.EHZ. 2021-07-20T17:39:43.46 0.6 undecidable manual S 11 0.4317 50 0.9 37
IV.SRES.HHZ. 2021-07-20T17:39:43.13 3.0 positive manual P 2.5 0
IV.MC2.EHZ. 2021-07-20T17:39:40.81 0.6 undecidable manual S 342 0.3651 50 0.21 47
IV.NRCA.HHZ. 2021-07-20T17:39:38.63 0.6 undecidable manual S 328 0.3184 50 -0.58 43
IV.CSP1.EHZ. 2021-07-20T17:39:37.51 1.0 negative manual P 349 0.5369 50 -0.13 23
IV.MF5.EHZ. 2021-07-20T17:39:36.03 0.1 undecidable manual P 11 0.4317 50 0.2 92
IV.LNSS.HHZ. 2021-07-20T17:39:36.01 0.3 undecidable manual S 280 0.2284 108 0.14 73
IV.T0110.HHZ. 2021-07-20T17:39:36.49 0.6 positive manual P 136 0.4614 50 0.14 46
IV.VCEL.EHZ. 2021-07-20T17:39:35.89 0.6 positive manual P 115 0.402 50 0.56 42
IV.TERO.HHZ. 2021-07-20T17:39:34.69 0.6 undecidable manual S 73 0.1988 110 -0.11 49
IV.GIGS.HHZ. 2021-07-20T17:39:34.45 0.6 undecidable manual S 124 0.2005 110 -0.42 46
IV.MTRA.EHZ. 2021-07-20T17:39:34.36 0.3 undecidable manual S 11 0.1961 110 -0.34 70
IV.MC2.EHZ. 2021-07-20T17:39:34.38 0.1 undecidable manual P 342 0.3651 50 -0.33 91
IV.GAVE.EHZ. 2021-07-20T17:39:33.99 0.6 undecidable manual P 291 0.3561 50 -0.55 43
IV.NRCA.HHZ. 2021-07-20T17:39:33.43 0.1 undecidable manual P 328 0.3184 50 -0.47 89
IV.MTRA.EHZ. 2021-07-20T17:39:31.23 0.1 undecidable manual P 11 0.1961 110 -0.06 99
IV.TERO.HHZ. 2021-07-20T17:39:31.34 0.1 undecidable manual P 73 0.1988 110 -0.01 100
IV.RM33.EHZ. 2021-07-20T17:39:31.70 0.6 undecidable manual S 240 0.1115 123 -0.07 50
IV.GIGS.HHZ. 2021-07-20T17:39:31.31 0.1 undecidable manual P 124 0.2005 110 -0.09 98
IV.LNSS.HHZ. 2021-07-20T17:39:31.86 0.1 undecidable manual P 280 0.2284 108 -0.11 98
MN.AQU.HHZ. 2021-07-20T17:39:31.78 0.1 undecidable manual P 168 0.2149 109 0.09 98
IV.SMA1.EHZ. 2021-07-20T17:39:30.47 0.6 undecidable manual S 353 0.0665 137 0.02 51
IV.T1299.HNZ. 2021-07-20T17:39:30.98 0.3 undecidable manual S 326 0.0836 131 0.05 76
IV.SMA1.EHZ. 2021-07-20T17:39:29.05 0.1 negative manual P 353 0.0665 137 0.21 99
IV.T1299.HNZ. 2021-07-20T17:39:29.36 0.1 undecidable manual P 326 0.0836 131 0.24 98
IV.RM33.EHZ. 2021-07-20T17:39:29.80 0.1 positive manual P 240 0.1115 123 0.2 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHE. ML:1.8 0.0010205 1.3 AML other m 2021-07-20T17:39:30.23
IV.SMA1.EHN. ML:1.9 0.001325 0.3 AML other m 2021-07-20T17:39:30.93
IV.RM33.EHN. ML:1.7 0.000691 1.06 AML other m 2021-07-20T17:39:32.65
IV.RM33.EHE. ML:1.8 0.000708 1.3 AML other m 2021-07-20T17:39:32.70
IV.TERO.HHN. ML:1.8 0.0004825 0.18 AML other m 2021-07-20T17:39:34.87
IV.TERO.HHE. ML:1.6 0.000258 0.28 AML other m 2021-07-20T17:39:34.98
IV.MTRA.EHE. ML:1.5 0.00024 1.58 AML other m 2021-07-20T17:39:35.85
IV.MTRA.EHN. ML:1.4 0.000186 1.38 AML other m 2021-07-20T17:39:35.87
IV.LNSS.HHN. ML:1.4 0.000142 0.66 AML other m 2021-07-20T17:39:36.18
IV.LNSS.HHE. ML:1.4 0.000165 0.46 AML other m 2021-07-20T17:39:36.89
IV.GAVE.EHE. ML:1.2 6.24E-5 0.42 AML other m 2021-07-20T17:39:42.89
IV.GAVE.EHN. ML:1.2 6.06E-5 1.36 AML other m 2021-07-20T17:39:43.04
IV.VCEL.EHE. ML:1.5 0.000107 0.5 AML other m 2021-07-20T17:39:44.45
IV.VCEL.EHN. ML:1.6 0.0001255 0.52 AML other m 2021-07-20T17:39:44.51
IV.T0110.HHN. ML:1.3 5.62E-5 1.62 AML other m 2021-07-20T17:39:45.18
IV.CSP1.EHE. ML:1.4 5.325E-5 0.6 AML other m 2021-07-20T17:39:46.27
IV.T0110.HHE. ML:1.4 6.255E-5 0.58 AML other m 2021-07-20T17:39:48.06
IV.CSP1.EHN. ML:1.5 6.245E-5 1.52 AML other m 2021-07-20T17:39:48.07
IV.MIDA.HHE. ML:1.8 4.36E-5 0.06 AML other m 2021-07-20T17:39:52.05
IV.LAV9.HHE. ML:2.7 0.0004585 0.38 AML other m 2021-07-20T17:40:05.26
IV.LAV9.HHN. ML:2.8 0.0004975 0.12 AML other m 2021-07-20T17:40:23.93
IV.MIDA.HHN. ML:2 5.82E-5 0.06 AML other m 2021-07-20T17:40:29.12
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