Earthquake with magnitude of ML 0.8 on date 01-08-2021 and time 05:15:33 (Italy) in region 4 km SW Castelbuono (PA)

A magnitude ML 0.8 earthquake occured in region: 4 km SW Castelbuono (PA), on

  • 01-08-2021 03:15:33 (UTC)
  • 01-08-2021 05:15:33 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.91, 14.058 at 6 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
Castelbuono PA 4 8943 8943
Isnello PA 6 1589 10532
Gratteri PA 10 963 11495
Geraci Siculo PA 10 1945 13440
Collesano PA 11 4054 17494
San Mauro Castelverde PA 12 1701 19195
Polizzi Generosa PA 12 3407 22602
Petralia Sottana PA 12 2821 25423
Pollina PA 12 2974 28397
Petralia Soprana PA 13 3360 31757
Castellana Sicula PA 14 3411 35168
Lascari PA 14 3588 38756
Scillato PA 15 613 39369
Cefal├╣ PA 15 14393 53762
Blufi PA 18 1029 54791
Caltavuturo PA 18 4017 58808
Campofelice di Roccella PA 18 7537 66345
Gangi PA 18 6811 73156
Tusa ME 18 2925 76081
Bompietro PA 18 1401 77482

Municipalities with at least 50000 inhabitants

An earthquake occurred to
46 Km N of Caltanissetta (63360 inhabitants)
52 Km E of Bagheria (55387 inhabitants)
65 Km E of Palermo (674435 inhabitants)
79 Km NE of Agrigento (59770 inhabitants)
95 Km N of Gela (75827 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 earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 0.8 2021-08-01
03:15:33
37.9102 14.0585 6 2021-08-01
03:20:28
Sala Sismica INGV-Roma 93473271
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-01 03:15:33 ± 0.29
Latitude 37.9102 ± 0.0117
Longitude 14.0585 ± 0.0160
Depth (km) 6 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 93473271

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1403
Semi-minor axis of confidence ellipse (meter) 1008
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 104
Circular confidence region, given by single value of horizontal uncertainty (meter) 1400
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 141
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.28958
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 5
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.2
Num. used stations 2
Type of magnitude ML
Reference to an origin 93473271
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-01 03:20:28
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MTGR.HHZ. 2021-08-01T03:15:58.06 3.0 undecidable manual Sn -0.05 0
IV.ACATE.EHZ. 2021-08-01T03:15:44.76 3.0 negative manual Pg 0.06 0
IV.ALJA.HHE. 2021-08-01T03:15:39.89 0.6 undecidable manual P 236 0.2896 100 0.06 50
IV.RESU.HHE. 2021-08-01T03:15:39.63 0.6 undecidable manual P 180 0.2635 101 0.37 47
IV.PLLN.EHZ. 2021-08-01T03:15:38.12 0.3 undecidable manual S 39 0.1061 116 0.27 75
IV.GIB.HHZ. 2021-08-01T03:15:37.42 0.3 undecidable manual S 342 0.0836 122 0.32 74
IV.GIB.HHZ. 2021-08-01T03:15:35.29 0.3 positive manual P 342 0.0836 122 -0.2 76
IV.PLLN.EHZ. 2021-08-01T03:15:35.51 0.6 positive manual P 39 0.1061 116 -0.41 48
IV.CSLB.HHZ. 2021-08-01T03:15:35.60 0.3 undecidable manual S 359 0.027 153 0.03 80
IV.CSLB.HHZ. 2021-08-01T03:15:34.29 0.1 negative manual P 359 0.027 153 -0.32 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSLB.HHE. ML:0 0.00011085 0.4 AML other m 2021-08-01T03:15:35.78
IV.CSLB.HHN. ML:0 0.0001555 1.48 AML other m 2021-08-01T03:15:36.76
IV.GIB.HHN. ML:0.9 0.0001475 0.34 AML other m 2021-08-01T03:15:37.69
IV.GIB.HHE. ML:0.7 9.005E-5 1.02 AML other m 2021-08-01T03:15:39.29
IV.MTGR.HHN. ML:1.9 6.902E-5 0.82 AML other m 2021-08-01T03:15:58.69
IV.MTGR.HHE. ML:1.8 5.195E-5 0.42 AML other m 2021-08-01T03:16:01.98
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