Earthquake with magnitude of ML 1.0 on date 31-08-2021 and time 08:42:18 (Italy) in region Costa Siciliana centro settentrionale (Palermo)

A magnitude ML 1.0 earthquake occured in region: Costa Siciliana centro settentrionale (Palermo), on

  • 31-08-2021 06:42:18 (UTC)
  • 31-08-2021 08:42:18 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 38.121, 13.896 at 5 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
Lascari PA 14 3588 3588
Cefal├╣ PA 14 14393 17981
Campofelice di Roccella PA 14 7537 25518
Gratteri PA 18 963 26481

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km E of Bagheria (55387 inhabitants)
47 Km E of Palermo (674435 inhabitants)
71 Km N of Caltanissetta (63360 inhabitants)
94 Km N of Agrigento (59770 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 1.0 2021-08-31
06:42:18
38.1208 13.8957 5 2021-12-29
11:12:53
Bollettino Sismico Italiano INGV 98501321
Reviewed
Rev100
ML 0.9 2021-08-31
06:42:19
38.0783 13.915 11 2021-08-31
06:46:20
Sala Sismica INGV-Roma 94854981
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-31 06:42:18 ± 0.26
Latitude 38.1208 ± 0.0135
Longitude 13.8957 ± 0.0080
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 98501321

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1560
Semi-minor axis of confidence ellipse (meter) 620
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 13
Circular confidence region, given by single value of horizontal uncertainty (meter) 1560
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 219
Number of associated phases, regardless of their use for origin computation 9
Number of defining phases 9
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) 0.16637
Epicentral distance of station farthest from the epicenter (degree) 0.28688
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitudes information

ML:1

Field Value
Value 1
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 98501321
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-12-14 10:34:56

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 94854981
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-31 06:46:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.SOLUN.HHE. 2021-08-31T06:42:29.59 0.6 undecidable manual S 264 0.2869 99 -0.53 45
IV.SCIAR.HHZ. 2021-08-31T06:42:27.42 0.6 undecidable manual S 213 0.214 102 0.07 50
IV.CSLB.HHZ. 2021-08-31T06:42:27.34 0.6 undecidable manual S 145 0.223 101 -0.37 47
IV.SOLUN.HHE. 2021-08-31T06:42:25.62 0.6 undecidable manual P 264 0.2869 99 0.22 48
IV.GIB.HHZ. 2021-08-31T06:42:25.69 0.6 undecidable manual S 142 0.1664 105 0.12 50
IV.SCIAR.HHZ. 2021-08-31T06:42:24.09 0.1 undecidable manual P 213 0.214 102 0.29 96
IV.PLLN.EHZ. 2021-08-31T06:42:24.33 0.3 undecidable manual P 123 0.2329 101 0.11 75
IV.CSLB.HHZ. 2021-08-31T06:42:23.68 0.1 undecidable manual P 145 0.223 101 -0.32 95
IV.GIB.HHZ. 2021-08-31T06:42:22.92 0.1 undecidable manual P 142 0.1664 105 0.16 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GIB.HHN. ML:1.1 0.00011975 0.58 AML other m 2021-08-31T06:42:27.54
IV.CSLB.HHE. ML:0.7 3.58E-5 0.68 AML other m 2021-08-31T06:42:27.39
IV.SCIAR.HHN. ML:1.1 7.89E-5 1.48 AML other m 2021-08-31T06:42:27.80
IV.GIB.HHE. ML:1 9.17E-5 0.92 AML other m 2021-08-31T06:42:27.46
IV.CSLB.HHN. ML:0.7 3.115E-5 0.2 AML other m 2021-08-31T06:42:28.59
IV.SCIAR.HHE. ML:1.1 7.82E-5 0.48 AML other m 2021-08-31T06:42:29.07
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