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Adib_14.m
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%% Purpose
% Search for precursors automatically for all detectable earthquakes with acceptable
% azimuthal angles accuracy by scanning 2 or 4 night time periods and all
% frequencies in ULF
%% Loading universal variables
load VARIABLES_WORLD
mag_min=5.0;
dis_max=180;
depth_max=200;
LT_start=[22,00,02,04];
LT_end=[00,02,04,06];
no_records=0;
%% Analysis starts
for stn_num=1:size(stn_vec,1)
for year=2005:2018
%% Checking files availability
stn=string(stn_vec(stn_num));
filepathname=strcat('E:\Study\MAGDAS DATA\',stn,'\',stn,string(year),'S.mat');
filecheck=exist(filepathname,'file');
if filecheck~=2 continue; end
disp(sprintf('Running on %s%d..',stn,year));
datenum_start=datenum([year,01,01,00,00,00]);
datenum_end=datenum([year,12,31,23,59,59]);
stn_latlon=[stn_MAGDAS(stn_num,2:3)];
region=string(station_vec(stn_num,2));
%% Building earthquakes table
EQ_table=NaN(1,11);
j=1;
for i=1:length(EQ_WORLD)
if datenum(EQ_WORLD(i,1:6))>=datenum_start && datenum(EQ_WORLD(i,1:6))<=datenum_end
EQ_table(j,:)=EQ_WORLD(i,:);
j=j+1;
end
if datenum(EQ_WORLD(i,1:6))>datenum_end
break;
end
end
i=1;
EQ_sel=NaN(1,8);
for j=1:size(EQ_table,1)
if EQ_table(j,10)>=mag_min
EQ_latlon=[EQ_table(j,7:8)];
EQ_dis=deg2km(distance('gc',stn_latlon,EQ_latlon));
EQ_time=datenum(EQ_table(j,1:6));
EQ_mag=EQ_table(j,10);
EQ_Ks=(10^(0.75*EQ_mag))/(EQ_dis+100);
EQ_depth=EQ_table(j,9);
EQ_angle=azimuth('gc',stn_latlon(1:2),EQ_latlon(1:2),'degree');
if EQ_dis<=dis_max && EQ_depth<=depth_max
EQ_sel(i,1)=EQ_time;
EQ_sel(i,2)=EQ_dis;
EQ_sel(i,3)=EQ_mag;
EQ_sel(i,4)=EQ_Ks;
EQ_sel(i,5)=EQ_depth;
EQ_sel(i,6:7)=EQ_latlon;
EQ_sel(i,8)=EQ_angle;
i=i+1;
end
end
end
EQ_selselidx=find( 0.025*EQ_sel(:,2)<EQ_sel(:,3)-4.5 | EQ_sel(:,3)>=6.5 | EQ_sel(:,2)<=30 );
EQ_selsel=EQ_sel(EQ_selselidx,:);
if isempty(EQ_selselidx)
disp('No detectable/significant earthquakes. Skipping..');
pause(0.5);
clc;
continue;
else
disp(sprintf('Found %d earthquake(s) to be analyzed',numel(EQ_selselidx)));
end
%% Loading geomagnetic data files
days_num=round(datenum_end-datenum_start);
if EQ_selsel(1,1)-datenum_start<60
disp('Previous year file need to be loaded..')
filepathname2=strcat('E:\Study\MAGDAS DATA\',stn,'\',stn,string(year-1),'S.mat');
if exist(filepathname2,'file')
matname(1)=strcat(stn,string(year-1),'S');
matname(2)=strcat(stn,string(year),'S');
A=load(matname(1));
B=load(matname(2));
H=vertcat(A.H,B.H);
D=vertcat(A.D,B.D);
Z=vertcat(A.Z,B.Z);
UT1m=horzcat(A.UT1m,B.UT1m);
H=H((end-(days_num+61)*86400)+1:end);
D=D((end-(days_num+61)*86400)+1:end);
Z=Z((end-(days_num+61)*86400)+1:end);
UT1m=UT1m((end-(days_num+61)*86400)+1:end);
disp('Previous year file has been loaded.');
prevyear=1;
else
matname=strcat(stn,string(year),'S');
load(matname);
H_nan=NaN(61*86400,1); D_nan=NaN(61*86400,1);
Z_nan=NaN(61*86400,1); UT1m_nan=UT1m(1)-61:1/86400:UT1m(1)-(1/86400);
H=vertcat(H_nan,H); D=vertcat(D_nan,D);
Z=vertcat(Z_nan,Z); UT1m=horzcat(UT1m_nan,UT1m);
disp('Previous year file is unavailable. Proceeding..');
prevyear=2;
end
else
matname=strcat(stn,string(year),'S');
load(matname);
prevyear=0;
end
datadatenum_start=min(UT1m); datadatenum_end=max(UT1m);
datenum_vec=datadatenum_start:floor(datadatenum_end);
days_vec=datetime(datenum_vec,'Format','dd/MM/yyyy','ConvertFrom','datenum');
days_num=length(days_vec);
date_vec=datevec(datenum_vec);
year_vec=unique(date_vec(:,1));
if prevyear==2 year_vec=year_vec(end); end
%% Removing noise/outlier
H_dn=H; D_dn=D; Z_dn=Z;
G_dn=sqrt(H_dn.^2+D_dn.^2);
for i=1:5
H_dn=medfilt1(H_dn,30,'omitnan','truncate');
D_dn=medfilt1(D_dn,30,'omitnan','truncate');
Z_dn=medfilt1(Z_dn,30,'omitnan','truncate');
G_dn=medfilt1(G_dn,30,'omitnan','truncate');
end
for i=1:5
H_sig=std(H_dn,'omitnan');
H_mu=mean(H_dn,'omitnan');
D_sig=std(D_dn,'omitnan');
D_mu=mean(D_dn,'omitnan');
Z_sig=std(Z_dn,'omitnan');
Z_mu=mean(Z_dn,'omitnan');
G_sig=std(G_dn,'omitnan');
G_mu=mean(G_dn,'omitnan');
for j=1:length(H_dn)
if H_dn(j)>H_mu+5*H_sig||H_dn(j)<H_mu-5*H_sig
H_dn(j)=NaN;
end
if D_dn(j)>D_mu+5*D_sig||D_dn(j)<D_mu-5*D_sig
D_dn(j)=NaN;
end
if Z_dn(j)>Z_mu+5*Z_sig||Z_dn(j)<Z_mu-5*Z_sig
Z_dn(j)=NaN;
end
if G_dn(j)>G_mu+5*G_sig||G_dn(j)<G_mu-5*G_sig
G_dn(j)=NaN;
end
end
end
%% Nighttime data in LT
for l=1:numel(LT_start)
LT_length(l)=LT_end(l)-LT_start(l);
if LT_length(l)<0 LT_length(l)=LT_length(l)+24; end
t_zone=timezone(stn_latlon(2),'degrees');
t_start(l)=LT_start(l)+t_zone;
if t_start(l)>24 t_start(l)=t_start(l)-24; end
if t_start(l)<0 t_start(l)=t_start(l)+24;end
t_starts(l)=t_start(l)*3600;
t_int(l)=LT_length(l)*3600;
for i=1:days_num
H_night(:,i,l)=H_dn(t_starts(l)+1:t_starts(l)+t_int(l));
D_night(:,i,l)=D_dn(t_starts(l)+1:t_starts(l)+t_int(l));
Z_night(:,i,l)=Z_dn(t_starts(l)+1:t_starts(l)+t_int(l));
G_night(:,i,l)=G_dn(t_starts(l)+1:t_starts(l)+t_int(l));
UT1m_night(:,i,l)=UT1m(t_starts(l)+1:t_starts(l)+t_int(l));
t_starts(l)=t_starts(l)+86400;
end
end
%% Spectrogram calculation
n_win=1800;
n_ovrlp=0.5*n_win;
n_fft=n_win;
fs=1;
for l=1:numel(LT_start)
for i=1:days_num
[H_spec,F_spec,T_spec]=spectrogram(H_night(:,i,l),'yaxis',hamming(n_win),n_ovrlp,n_fft,1);
[D_spec,F_spec,T_spec]=spectrogram(D_night(:,i,l),'yaxis',hamming(n_win),n_ovrlp,n_fft,1);
[Z_spec,F_spec,T_spec]=spectrogram(Z_night(:,i,l),'yaxis',hamming(n_win),n_ovrlp,n_fft,1);
[G_spec,F_spec,T_spec]=spectrogram(G_night(:,i,l),'yaxis',hamming(n_win),n_ovrlp,n_fft,1);
bin001=find(round(F_spec,4)==0.0100); bin01=find(round(F_spec,4)==0.1000);
H_spec1=H_spec(bin001:bin01,:);
D_spec1=D_spec(bin001:bin01,:);
Z_spec1=Z_spec(bin001:bin01,:);
G_spec1=G_spec(bin001:bin01,:);
F_spec1=F_spec(bin001:bin01);
Z_spec_mu(:,i,l)=mean(abs(Z_spec1),2);
G_spec_mu(:,i,l)=mean(abs(G_spec1),2);
ZG(:,i,l)=Z_spec_mu(:,i,l)./G_spec_mu(:,i,l);
for j=1:size(H_spec1,1)
XX=real(H_spec1(j,:));
YY=real(D_spec1(j,:));
ZZ=real(Z_spec1(j,:));
XY_mat=[XX;YY];
ZZ_mat=(ZZ');
AB=(inv(XY_mat*XY_mat'))*(XY_mat*ZZ_mat);
azim_amp(j,i,l)=sqrt(AB(1)^2+AB(2)^2);
azim_theta1=atan2d(AB(2),AB(1));
if azim_theta1<0 azim_theta1=360+azim_theta1; end
azim_theta(j,i,l)=azim_theta1;
end
end
end
%% Identifying disturbed days
geomag_day1=find(datenum(index_geomag(:,1),1,index_geomag(:,2))==datadatenum_start);
for l=1:numel(LT_start)
geomag_day=geomag_day1(t_start(l)); %+1 hour backward
k=1;
for i=geomag_day:24:length(index_geomag)
ap(:,k,l)=index_geomag(i:i+3,6); %+1 hour onward
Dst(:,k,l)=index_geomag(i:i+3,5);
k=k+1;
if k>days_num break; end
end
end
ZG_quiet=ZG;
for l=1:numel(LT_start)
for i=1:days_num
if any(ap(:,i,l)>50) || any(Dst(:,i,l)<-50)
ZG_quiet(:,i,l)=deal(NaN);
end
end
end
if all(all(isnan(ZG_quiet)))
disp('No data available prior to the earthquake(s). Skipping');
pause(0.5);
continue;
end
%% Identifying precursors
for a=1:size(EQ_selsel,1)
for b=1:24
EQ_foundpre{a,b}='N/A';
end
end
days_backwards=[30,45,60];
for n=1:size(EQ_selsel,1)
time_now=datetime('now','Format','dd-MM-yyyy HH:mm');
if 0.025*EQ_selsel(n,2)<EQ_selsel(n,3)-4.5 EQ_dtctblty='Yes';
else EQ_dtctblty='No'; end
EQ_foundpre{n,1}=char(time_now);
EQ_foundpre{n,2}=sprintf('%s: %d %d %d)',stn,year_vec);
EQ_foundpre{n,3}=sprintf('%s',region);
EQ_foundpre{n,4}=[];
EQ_foundpre{n,5}=sprintf('%s',datetime(EQ_selsel(n,1),'ConvertFrom','datenum','Format','dd-MM-yyyy HH:mm:ss'));
EQ_foundpre{n,6}=sprintf('%.1f',EQ_selsel(n,3));
EQ_foundpre{n,7}=sprintf('%.0f',EQ_selsel(n,5));
EQ_foundpre{n,8}=sprintf('%.0f',EQ_selsel(n,2));
EQ_foundpre{n,9}=sprintf('%.2f',EQ_selsel(n,4));
EQ_foundpre{n,10}=sprintf('%s',EQ_dtctblty);
EQ_foundpre{n,11}=sprintf('%.2f',EQ_selsel(n,8));
EQ_foundpre{n,12}=sprintf('%.2f',EQ_selsel(n,6));
EQ_foundpre{n,13}=sprintf('%.2f',EQ_selsel(n,7));
EQ_foundpre{n,14}=[];
for f=1:numel(days_backwards)
days_bckwrd=days_backwards(f);
ZG_flex=ZG_quiet;
EQ_dateidx=find(floor(EQ_selsel(n,1))==datenum_vec);
foundpre=0;
days_range=EQ_dateidx:-1:EQ_dateidx-days_bckwrd;
for m=1:10
p=0;
clearvars max_ZG max_ZGidx
for o=EQ_dateidx:-1:EQ_dateidx-days_bckwrd
p=p+1;
max_ZG(p)=max(max(ZG_flex(:,o,:)));
max_ZGlinidx=find(ZG_flex(:,o,:)==max_ZG(p));
mat_dim=[size(ZG_flex,1),size(ZG_flex,3)];
if ~isempty(max_ZGlinidx)
max_ZGlinidx=max_ZGlinidx(1);
[max_ZGidx(1,p),max_ZGidx(2,p)]=ind2sub(mat_dim,max_ZGlinidx);
else
max_ZGidx(1:2,p)=[NaN,NaN]; end
end
max_ZG_flex=max_ZG;
for q=1:size(max_ZG,2)
[r,s]=max(max_ZG_flex);
if isnan(r) continue; end
azim_ZG=azim_theta(max_ZGidx(1,s),days_range(s),max_ZGidx(2,s));
azim_EQ=EQ_selsel(n,8);
diff_angle=azim_ZG-azim_EQ;
if diff_angle<-180 diff_angle=diff_angle+360;
elseif diff_angle>180 diff_angle=diff_angle-360; end
if abs(diff_angle)<=20
EQ_foundpre{n,15}=sprintf('%s',days_vec(days_range(s)));
EQ_foundpre{n,16}=sprintf('%02d - %02d',LT_start(max_ZGidx(2,s)),LT_end(max_ZGidx(2,s)));
EQ_foundpre{n,17}=sprintf('%.4f',r);
EQ_foundpre{n,18}=sprintf('%.4f',Z_spec_mu(max_ZGidx(1,s),days_range(s),max_ZGidx(2,s)));
EQ_foundpre{n,19}=sprintf('%.4f',G_spec_mu(max_ZGidx(1,s),days_range(s),max_ZGidx(2,s)));
EQ_foundpre{n,20}=sprintf('%d',floor(EQ_selsel(n,1))-datenum_vec(days_range(s)));
EQ_foundpre{n,21}=sprintf('%.4f',round(F_spec1(max_ZGidx(1,s)),4));
EQ_foundpre{n,22}=sprintf('%.2f',azim_ZG);
EQ_foundpre{n,23}=sprintf('%.2f',diff_angle);
EQ_foundpre{n,24}=sprintf('%d',m);
foundpre=1;
break;
else
max_ZG_flex(s)=NaN;
if all(isnan(max_ZG_flex))
break;
end
end
end
if foundpre==1
break;
else
for x=1:length(days_range)
if isnan(max_ZGidx(1,x)) continue; end
ZG_flex(max_ZGidx(1,x),days_range(x),max_ZGidx(2,x))=NaN;
end
end
end
if foundpre==1 break; end
end
end
%% Writing to xls file
xlsfilename='D:\Study\Record of appearance of earthquakes geomagnetic precursor.xlsx';
xlssheetname='Adib_14g';
[readxcel1,readxcel2,readxcel]=xlsread(xlsfilename,xlssheetname);
empcell=size(readxcel,1)+1;
xlsrange=strcat('A',string(empcell),':X',string(empcell+size(EQ_foundpre,1)-1));
xlswrite(xlsfilename,EQ_foundpre,xlssheetname,xlsrange)
disp(sprintf('Records made. Analysis on %s%d has completed.',stn,year));
%% Clearing variables
no_records=no_records+size(EQ_foundpre,1);
clearvars -except mag_min dis_max depth_max LT_start LT_end stn_num year stn_vec stn_MAGDAS station_vec index_geomag EQ_WORLD no_records
pause(0.5);
clc;
end
end
disp(sprintf('Analysis ends. %d of earthquakes recorded.',no_records));