Earthquake with magnitude of ML 0.5 on date 20-04-2021 and time 05:50:20 (Italy) in region 3 km E Pizzoli (AQ)

A magnitude ML 0.5 earthquake occured in region: 3 km E Pizzoli (AQ), on

  • 20-04-2021 03:50:20 (UTC)
  • 20-04-2021 05:50:20 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.444, 13.328 at 12 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
Pizzoli AQ 3 4326 4326
Barete AQ 4 737 5063
Cagnano Amiterno AQ 9 1369 6432
Capitignano AQ 9 665 7097
Scoppito AQ 10 3727 10824
Montereale AQ 11 2581 13405
L'Aquila AQ 12 69753 83158
Campotosto AQ 13 542 83700
Lucoli AQ 17 1011 84711
Crognaleto TE 17 1297 86008
Tornimparte AQ 17 3187 89195
Borbona RI 18 617 89812

Municipalities with at least 50000 inhabitants

An earthquake occurred to
12 Km NW of L'Aquila (69753 inhabitants)
39 Km SW of Teramo (54892 inhabitants)
57 Km E of Terni (111501 inhabitants)
68 Km W of Montesilvano (53738 inhabitants)
69 Km NE of Tivoli (56533 inhabitants)
70 Km NE of Guidonia Montecelio (88673 inhabitants)
70 Km W of Chieti (51815 inhabitants)
73 Km W of Pescara (121014 inhabitants)
76 Km SE of Foligno (57155 inhabitants)
93 Km NE of Roma (2864731 inhabitants)
96 Km NE of Velletri (53303 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000
ML 0.5 2021-04-20
03:50:20
42.4442 13.3278 13 2021-07-12
16:55:16
Bollettino Sismico Italiano INGV 91699851
Reviewed
Rev100
ML 0.6 2021-04-20
03:50:19
42.4238 13.3418 11 2021-04-20
04:19:15
Sala Sismica INGV-Roma 89281861
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-20 03:50:20 ± 0.15
Latitude 42.4442 ± 0.0045
Longitude 13.3278 ± 0.0061
Depth (km) 13 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 91699851

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 567
Semi-minor axis of confidence ellipse (meter) 256
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 38
Circular confidence region, given by single value of horizontal uncertainty (meter) 570
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 159
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.2707
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 8
Magnitudes information

ML:0.5

Field Value
Value 0.5
Uncertainty 0.3
Num. used stations 4
Type of magnitude ML
Reference to an origin 91699851
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-22 09:13:05

ML:0.6

Field Value
Value 0.6
Uncertainty 0.3
Num. used stations 4
Type of magnitude ML
Reference to an origin 89281861
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-20 04:19:15
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ZEN8.EHZ. 2021-04-20T03:52:15.94 3.0 undecidable manual Sg 13.04 0
AC.KBN.HHZ. 2021-04-20T03:52:07.84 3.0 negative manual Pg 21.33 0
IV.ACATE.HNZ. 2021-04-20T03:51:55.30 3.0 positive manual Pg 14.45 0
GU.BLANC.HHZ. 2021-04-20T03:51:50.31 3.0 undecidable manual Pn 4.78 0
IV.HVIT.HHZ. 2021-04-20T03:51:40.47 3.0 positive manual Pn -0.84 0
IV.SEI.HHZ. 2021-04-20T03:51:25.39 3.0 undecidable manual Sn 0.15 0
MN.TRI.HHZ. 2021-04-20T03:51:19.75 3.0 undecidable manual Pg 7.96 0
CR.ZAG.BHZ. 2021-04-20T03:51:18.72 3.0 undecidable manual Pn -1.15 0
IV.VAGA.HHZ. 2021-04-20T03:50:57.18 3.0 undecidable manual S -2.62 0
IV.VIVA.HHZ. 2021-04-20T03:50:35.83 3.0 positive manual P 0.02 0
IV.LNSS.HHZ. 2021-04-20T03:50:30.87 0.6 undecidable manual S 307 0.2644 95 0.12 48
IV.TERO.HHZ. 2021-04-20T03:50:30.47 0.3 undecidable manual S 49 0.2707 95 -0.46 67
IV.GIGS.HJZ. 2021-04-20T03:50:28.36 0.6 undecidable manual S 87 0.1808 101 0.07 49
IV.T1299.EHE. 2021-04-20T03:50:28.90 0.3 undecidable manual S 350 0.1934 99 0.25 71
IV.SMA1.EHZ. 2021-04-20T03:50:28.69 0.6 undecidable manual S 2 0.1862 100 0.24 47
MN.AQU.HNZ. 2021-04-20T03:50:26.27 0.6 undecidable manual S 148 0.1061 122 0.04 50
IV.RM33.EHZ. 2021-04-20T03:50:26.01 0.3 undecidable manual S 308 0.1061 122 -0.2 73
IV.LNSS.HHZ. 2021-04-20T03:50:26.27 0.3 undecidable manual P 307 0.2644 95 -0.12 71
IV.TERO.HHZ. 2021-04-20T03:50:26.66 0.3 undecidable manual P 49 0.2707 95 0.16 71
IV.CAMP.HHZ. 2021-04-20T03:50:26.20 0.6 undecidable manual S 33 0.1097 121 -0.1 50
IV.SMA1.EHZ. 2021-04-20T03:50:25.15 0.1 undecidable manual P 2 0.1862 100 0.08 98
IV.T1299.EHE. 2021-04-20T03:50:24.94 0.3 undecidable manual P 350 0.1934 99 -0.24 71
IV.GIGS.HJZ. 2021-04-20T03:50:24.96 0.3 undecidable manual P 87 0.1808 101 -0.01 74
IV.CAMP.HHZ. 2021-04-20T03:50:23.93 0.3 undecidable manual P 33 0.1097 121 0.1 74
MN.AQU.HNZ. 2021-04-20T03:50:23.90 0.3 undecidable manual P 148 0.1061 122 0.12 75
IV.RM33.EHZ. 2021-04-20T03:50:23.85 0.1 undecidable manual P 308 0.1061 122 0.08 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RM33.EHN. ML:0.7 5.615E-5 0.46 AML other m 2021-04-20T03:50:26.33
IV.RM33.EHE. ML:0.7 5.115E-5 0.44 AML other m 2021-04-20T03:50:26.66
IV.SMA1.EHE. ML:0.5 1.802291E-5 0.16 AML other m 2021-04-20T03:50:28.88
IV.TERO.HHE. ML:0 6.985177E-6 0.5376 AML other m 2021-04-20T03:50:31.67
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