segy.h

阐述了建立物质本构关系时应满足的基本公理, 较详细地推导了各种类型粘 弹性物质的本构关系, 论述了变率理论与泛函理论之间的关系, 推导了对于粘弹性问题 求解具有实用意义的对应定理, 并以简单的例子

struct trace_header_struct {
    long  reel_trace_number;		/*	0	0	0	*/
    long  line_trace_number;		/*	1	2	4	*/
    long  orig_field_rec_num;		/*	2	4	8	*/
    long  orig_trace_num_in_rec;	/*	3	6	12	*/
    long  energy_src_point_num;		/*	4	8	16	*/
    long  CDP_ensemble_num;		/*	5	10	20	*/
    long  trace_num_in_CDP;		/*	6	12	24	*/
    short trace_id_code;		/*	7	14	28	*/
    short num_vert_sum_traces;		/*	7.5	15	30	*/
    short num_horz_stack_traces;	/*	8	16	32	*/
    short data_use;			/*	8.5	17	34	*/
    long  source_to_rec_grp_dist;	/*	9	18	36	*/
    long  rec_grp_elevation;		/*	10	20	40	*/
    long  src_surface_elevation;	/*	11	22	44	*/
    long  src_depth_below_surface;	/*	12	24	48	*/
    long  datum_elevation_at_rec_grp;	/*	13	26	52	*/
    long  datum_elevation_at_src;	/*	14	28	56	*/	
    long  water_depth_at_src;		/*	15	30	60	*/
    long  water_depth_at_grp;		/*	16	32	64	*/
    short depth_scaler;			/*	17	34	68	*/
    short coordinate_scaler;		/*	17.5	35	70	*/
    long  src_coord_x;			/*	18	36	72	*/
    long  src_coord_y;			/*	19	38	76	*/
    long  grp_coord_x;			/*	20	40	80	*/
    long  grp_coord_y;			/*	21	42	84	*/
    short coord_units;			/*	22	44	88	*/
    short weathering_velocity;		/*	22.5	45	90	*/
    short subweathering_velocity;	/*	23	46	92	*/
    short uphole_time_at_src;		/*	23.5	47	94	*/
    short uphole_time_at_grp;		/*	24	48	96	*/
    short src_static_correction;	/*	24.5	49	98	*/
    short group_static_correction;	/*	25	50	100	*/
    short total_static_applied;		/*	25.5	51	102	*/
    short lag_time_a;			/*	26	52	104	*/
    short lag_time_b;			/*	26.5	53	106	*/
    short delay_recording_time;
    short mute_time_start;
    short mute_time_end;
    short num_samples_in_trace;
    short sample_interval;
    short gain_type;
    short gain_constant;
    short initial_gain;
    short correlated;
    short sweep_start_freq;
    short sweep_end_freq;
    short sweep_length;
    short sweep_type;
    short sweep_trace_taper_len_start;
    short sweep_trace_taper_len_end;
    short taper_type;
    short alias_filter_freq;
    short alias_filter_slope;
    short notch_filter_freq;
    short notch_filter_slope;
    short low_cut_freq;
    short high_cut_freq;
    short low_cut_slope;
    short high_cut_slope;
    short year_data_recorded;
    short day_of_year;
    short hour_of_day;
    short minute_of_hour;
    short second_of_minute;
    short time_basis_code;
    short trace_weighted_factor;
    short grpnum_switch_pos_one;
    short grpnum_trace_one;
    short grpnum_last_trace;
    short gap_size;
    short overtravel;
    /* FROM THIS POINT ON, SEG-Y TRACE HEADER IS UNASSIGNED */
    /* Any veritas extensions are listed here                   */
    char  unassigned[52];
    long  veritas_first_break_time;
    long  veritas_first_break_depth;
};

struct reel_chrhdr_struct {
    char line[40][80];
};

struct reel_binhdr_struct {
    long        job_id;				/*	0	0	0	*/
    long        line_number;			/*	1	2	4	*/
    long        reel_number;			/*	2	4	8	*/
    short int   data_traces_per_rec;		/*	3	6	12	*/
    short int   aux_traces_per_rec;		/*	3.5	7	14	*/
    short int   sample_interval;		/*	4	8	16	*/
    short int   sample_interval_orig;		/*	4.5	9	18	*/
    short int   samples_per_trace;		/*	5	10	20	*/
    short int   samples_per_trace_orig;		/*	5.5	11	22	*/
    short int   data_sample_format;		/*	6	12	24	*/
    short int   CDP_fold;			/*	6.5	13	26	*/
    short int   trace_sort_code;		/*	7	14	28	*/
    short int   vertical_sum_code;		/*	7.5	15	30	*/
    short int   sweep_start_freq;		/*	8	16	32	*/
    short int   sweep_end_freq;			/*	8.5	17	34	*/
    short int   sweep_length;			/*	9	18	36	*/
    short int   sweep_type_code;		/*	9.5	19	38	*/
    short int   sweep_trace_number;		/*	10	20	40	*/
    short int   sweep_trace_taper_length_start;	/*	10.5	21	42	*/
    short int   sweep_trace_taper_length_end;	/*	11	22	44	*/
    short int   taper_type;			/*	11.5	23	46	*/
    short int   correlated_data;		/*	12	24	48	*/
    short int   binary_gain_recovered;		/*	12.5	25	50	*/
    short int   ampl_recovery_method;		/*	13	26	52	*/
    short int   measurement_system;		/*	13.5	27	54	*/
    short int   impulse_signal_polarity;	/*	14	28	56	*/
    short int   vibratory_polarity_code;	/*	14.5	29	58	*/
    /* From this point on, seg-y considers fields as unassigned */
    /* My own extensions are listed here                   */
    short int   source_orientation; 		/*	15	30	60	*/
    short int   receiver_orientation;	        /*	15.5	31	62	*/
    float	veritas_plot_scale;		/*	16	32	64	*/
    short int   source_wavesep_flg;		/*	17	34	68	*/
    short int   receiver_wavesep_flg;		/*	17.5	35	70	*/
    long  int   veritas_src_rcvr_offset;   	/*	18	36	72	*/
    char        unassigned[324];
};

struct reel_header_struct {
    struct reel_chrhdr_struct chr;
    struct reel_binhdr_struct bin;
};

/* Use these typedefs whenever possible - don't use structure names */
typedef struct reel_binhdr_struct       SEGY_BINARY_HEADER_TYPE;
typedef struct reel_chrhdr_struct       SEGY_CHRARACTER_HEADER_TYPE;
typedef struct reel_header_struct       SEGY_REEL_HEADER_TYPE;
typedef struct trace_header_struct      SEGY_TRACE_HEADER_TYPE;

/* Avoid using these typedefs - they're obsolete */
typedef struct reel_binhdr_struct       BINHDR_TYPE;
typedef struct reel_chrhdr_struct       CHRHDR_TYPE;
typedef struct reel_header_struct       REELHDR_TYPE;
typedef struct trace_header_struct      TRACEHDR_TYPE;